Jim, I am admittedly a little biased, since I am on my 2nd Infiniti (both mine have been RWD)... but the G37xS is one bad mofo. The A4 has what? 211 hp in a turbocharged 4 banger?
The G37xS has 328 hp from a naturally aspirated V6, plenty of giddyup, and it's very reliable. I can't say that the AWD system in an Infiniti is going to come close to the Audi Quattro, since most AWD fans say the Audi system is the best, but as far as bang for the buck, it's tough to beat.
I have heard that Subaru does AWD extremely well, too. Acura has the TL in AWD, so that's another option.
I'd shop around, drive a bunch of different cars, and see what you like.
MACS wrote: