2001 BMW 3 Series 330xi AWD 4dr Sedan (3.0L 6cyl 5M)
We bought this car used 2 years ago and our love affair with it has not ceased from the moment it first beautified our driveway. Fun to drive (I wanted a manual and am so pleased with the 5-speed manual on this car), great power, looks gorgeous, fantastic Harmon-Kardon stereo system (stuck in traffic? great!) and did I mention fun to drive? Also, no mechanical/reliability issues and the minor issues that have popped up were covered under BMW's used- car extended warranty.
Looks, handling, power, stops on a dime, performance, comfort, stereo system, automatic rear-view mirror dimmer, memory-position for driver's seat, safety.
Heated steering wheel is the only thing I can think of to improve this fine piece of German engineering.