Definitely wait a year for a car!!!. There is absolutely no reason to buy a BRAND NEW CAR EVER, unless you are buying an r8, lambo, ferrari, and even those you can wait. Buy it with 5000 or more because a car will lose 30% or more of its value as soon as you buy it.
1. Never been to keen on infinitis. Infinity is too round. Too many shapes. No concrete sharp lines. Not sporty-looking enough. Unless you get a coupe, I feel the new infinitis are the new "older people" car like Lexus used to be.
2. Lexus is no longer an "old people car. "GS f sport man that car, unbelievable looks, beats the rest very comfortable and fast. The new face Lexus blew my mind. People say they are ugly and i tell them, you must be jealous or out of your damn mind. That front, the whole F style and the maroon interior is gorgeous. Not to forget how comfortable smooth and quiet Lexus are, and the F sport is fast. If you're going to go with Lexus, then go with the GS over IS, more room, and looks better. DEFINITELY go with GS if you are willing.
3. BMWs are sporty but not as comfortable, not the BMW that used to be. BMW is not as comfortable and the 5 series looks like a boat nowadays. If you are going to go with BMW then why don you buy an older M3. Nothing says business 30s single than a m3. Why in your right mind would you spend 50k+ on a new BMW BS M package that looks like SH!T when you can buy 2009+ actual M3 with 20k miles or less for 40k+.
4. Mercedes, very comfortable yet quality in interior is, again, not what Mercedes used to be. I like the e-class but not CRAZY about it. I find Mercedes boring nowadays. Mercedes hasn't really changed lately. It looks nice but i feel like its the same damn thing, although that's what Mercedes wants.
Bottom line. if you want the best NEW looking, most dramatically changed car and don't want to wait, go for the GS because it looks new, it looks like it changed. If you are wiling to go for a car a few years older, than go with M3, S4, AMG. If you're going to drop 50k, dont drop it on what EVERYBODY ELSE IS DRIVING.