Well, you are guaranteed to choose a great car to get. Surprisingly this question is quite common and to be honest, the Camaro would be the best choice for obvious reasons, I mean a 4.5 sec 0-60 time compared to a 6 sec one. Well I will let you choose, here are the Pros/Cons for the 2009 Chevrolet Camaro and 2009 Audi A5:
2010 Chevrolet Camaro SS
Pros:
+ The long hood and short deck are pushed to the far corners of the muscular fender forms and a fast, 67-degree rake windshield contributes to aerodynamic performance that includes a 0.37 coefficient of drag
+ The Chevrolet Camaro is equipped with the standard 18-inch, or optional 19-inch or 20-inch wheels, the relationship of the top of the tire and bottom of the fender is consistent on all models
+ All models also feature the classic "V" design motif in the nose
+ Along with a 2.5-inch (63.5 mm) power dome in the aluminum hood
+ Designers took a cue from Corvette and sculpted twin cockpits across the roof, giving the vehicle a distinctive Chevrolet presence
+ The B-pillar is invisible to the eye, lending the true appearance of a hardtop coupe
+ A one-piece body stamping provides a cleaner overall side appearance that is free of seams, gaps or plastic appliqués
+ "Gills" located in the front of the rear quarter panel also are familiar Chevrolet Camaro styling cues
+ Ten exterior colors are available and include Black, Victory Red, Rally Yellow and Silver Ice Metallic
+ The 6.2L Engine will jump to 60 in 4.6 sec and top speed of 150+ mph
+ Inside the four-passenger cabin, a well-executed balance of heritage, modern design and attention to detail conveys simplicity and refinement with contemporary details in the cluster, switches, dials and lighting
+ Deep, recessed gauges, located in square housings outlined in chrome, give a nod to the classic Camaro interior
+ Leather Upholstery
+ Eight-Way automatic seats allow the driver and passenger to have a greater spectrum on comfort
+ All models include a three-spoke steering wheel with manual tilt/telescope adjustment
+ Cruise control and rear defog also are standard, while a leather-wrapped steering wheel and shift knob; redundant steering wheel controls; Bluetooth and USB port are part of the available Driver Convenience and Connectivity package. Also included in the package is remote start on automatic transmission-equipped vehicles, as well as a personal device interface module for iPods
+ All models also include power door locks and express up and down driver and passenger window. Cargo capacity can be increased with the standard fold-down rear seat. The capacity of the trunk is 11.3 cubic feet (320 liters).
+ An advanced 6.2L direct-injected V-8 with variable valve timing is standard on LS and LT models. It offers power and efficiency, with 400+ horsepower and EPA-rated 22 mpg in highway driving.
+ The fuel injectors are located beneath the intake ports and fuel is injected directly into the cylinder. The result is better efficiency in the combustion process leading to increased fuel efficiency at part and full throttle.
+ All Chevrolet Camaro models can be equipped with either a six-speed manual or six-speed automatic transmission.
+ Fully independent front and rear suspensions are the underpinnings of the 2010 Chevrolet Camaro. The standard independent rear suspension is a first for Chevrolet Camaro and is designed to compete with the best in the world. It's a 4.5-link system that includes a unique, L-shaped upper control arm that attaches to the knuckle at one end and incorporates a ride bushing in the rear.
+ All SS models have a competitive/sport mode that optimizes the electronic stability control system for competitive driving and track conditions. It provides a less governed level of stability control for expert driving on race tracks. The stability control system engages only in severe oversteer or extreme acceleration in this mode
+ The SS front brake package includes Brembo 355 mm x 32 mm vented rotors with four-piston aluminum calipers. Semi-metallic brake linings are used at all four corners on FE3 models for superior fade resistance and pedal feel. The rear brakes are vented Brembos measuring 365 mm x 28 mm, with aluminum four-piston calipers
+ The steering ratio is 16.1:1
+ Sport Tuned Suspension
+ New for Chevrolet Camaro SS models with a manual transmission is Performance Launch Control that is enabled in the competitive mode. It is designed to control wheel slip to an optimal level, allowing hard accelerations at launch to achieve maximum grip and vehicle acceleration
Cons:
+ There have been 2 recalls for the Camaro but that was on the SS model
+ Reliability is 6/10
+ The Chevrolet Camaro was featured on the Top 5 Hardest Cars to Find by Yahoo! Autos.
+ Dealerships will hike up the price of the Camaro since it is hard to find
+ Ride Quality may be harsh for some people
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2009 Audi A5:
Pros:
+ The ESP electronic stabilisation programme can be deactivated in two stages whenever the driver wishes to exploit the potential of the Audi S5 to the full on a suitable stretch of road.
+ Audi A5 forms a balanced synthesis of sportiness and elegance
+ The radiator grille possesses the specific look of an Audi S model
+ Painted in platinum grey and fitted with vertical chrome inlays
+ The front and rear bumpers have a more pronounced outline and the air inlet grilles are more striking
+ The aluminium-look exterior mirror housings make an overtly sporty impression
+ Dual-branch exhaust system
+ Sports seats
+ Sports steering wheel
+ Instruments with grey dials and aluminium door sill plates provide a dynamic and refined atmosphere
+ Impressive daytime running lights in the form of an LED light strip
+ Above Average Reliability
+ 3.2 L Engine offers an amazing 265 HP which will jolt the Audi A5 to 60 in 6 seconds
+ Comes Standard with Audi's infamous Quattro which delivers superior handling
+ Audi A5's sports suspension is tuned to enhance the coupé's performance with particularly dynamic handling
+ The ESP electronic stabilisation programme will exploit the potential of the Audi A5 to the full on a suitable stretch of road.
Cons:
+ Harsh Ride
+ Quattro AWD does not give the fastest 0-60 times
+ Low Power-To-Weight Ratio
I would obviously go ahead with the Chevrolet Camaro but I can only give you advice, you are the one who makes the final decision.
New Cars For Around 45,000:
2009 Nissan 370z Nismo (RWD 0-60 4.5 sec)
2009 Honda Accord EX-L V6 Coupe (FWD, 0-60: 5.7)
2008 Nissan 350z ( RWD, 0-60: 4.9)
2010 Ford Mustang GT (RWD 0-60: 4.9)
2009 Hyundai Genesis Coupe 3.8 V6 w/ Track Pack (RWD 0-60: 5.4)
2009 Mazda RX-8 (RWD 0-60 5.6 sec)
2009 Dodge Challenger R/T (RWD 0-60 5.5 sec)
2009 Chevrolet Camaro SS (RWD 0-60 4.5 Sec)
2009 Nissan Altima Coupe 3.5 S (FWD 0-60 5.8 sec)
2009 Nissan 370z (RWD 0-60 4.7 sec)
2009 Dodge Challenger SE (RWD 0-60 7.7 sec)
2009 BMW 335i (RWD 0-60 4.6 sec)
2009 Pontiac G8 GXP (RWD 0-60 4.6 sec)
2009 BMW Z4 (RWD 0-60 6.5 sec)
2010 Mini John Work’s Cooper (FWD 0-60 6.2 sec)
2009 Audi S4 (AWD 0-60 5.3 sec)
2009 Infiniti G37 Convertible (RWD 0-60 5.6 sec)
2009 Lexus IS 250C/350C (RWD 0-60 5.9-8.4 sec)
2009 Mercedes-Benz C 350 (RWD 0-60 5.7 sec)
2010 Audi TT/TT-S (FWD/AWD 0-60 5.3-7.3 sec)
2009 Cadillac CTS (RWD 0-60 5.8 sec)
2009 Dodge Challenger SRT-8 (RWD 0-60 4.9 sec)
2010 Ford Mustang GT500 (RWD 0-60 4.3 sec)
2009 Dodge Charger SRT-8 (RWD 0-60 4.9 sec)
2009 Lexus GS 350 (RWD 0-60 6.7 sec)
2009 Mitsubishi Evo X (AWD 0-60 4.6 sec)
2009 BMW 3 Series Sedan/Coupe (RWD 0-60 6.3 sec)
2009 Infiniti G37 w/ Sport Package & Nav Package (RWD 0-60 4.9 sec)
2009 Audi A5 Coupe (AWD 0-60 6 sec)
2009 Subaru Impreza WRX STi (AWD 0-60 4.7 sec)
2009 Lexus IS 350 (RWD 0-60 5.6 sec)
2009 BMW 135i Twin Turbo (RWD 0-60 4.6 sec)
2009 Pontiac Solstice GXP (RWD 0-60 5.4 sec)
2009 Saturn Sky Redline (RWD 0-60 5.6 sec)
2009 Honda S2000 CR (RWD 0-60 5.3 sec) (Quite A rare car and it comes with a removable hardtop and since this is the last year for the S2000 the car is expected to go up in value)
HOPE THIS HELPS!!!