2005 Audi A4 New 3.2 quattro AWD 4dr Sedan (3.1L 6cyl 6A)
I bought this car about 4 or 5 months ago, and i love it. For a V6 it seems far more powerful than a V6 on any other car. Not only does the engine feel powerful, but it sounds amazing, I always used to listen to the radio, but now generally leave it on a low volume so i can listen to the engine. The interior is not made for a 6-speed, as the armrest covers the cut hold and hand-break, so i would recommend an auto. I've had some problems with the headlight bulbs, which are decently costly, but that's natural as I'm approaching 100k miles. I baby this car though, i clay and wax it several times a year, definitely feels like a show car that's fun to drive!
Everything -- engine, appearance, AWD system (quattro), the comfort, smooth cornering, handling.
The design of the interior (the armrest covering the cup holder and hand break, which has been addressed and fixed on Audi's B8 new models. (2009+)