2002 Audi S6 Avant quattro AWD 4dr Wagon (4.2L 8cyl 5A)
Picked up my S6 as a CPO car after lusting after one for years. I previously owned a 2000 A6 sedan, and the S6 is everything I wish that car had been. This is simply the best wagon ever: gorgeous, fast, luxurious, and incredibly useful. The fuel mileage is abysmal, but I was fully awared of that going in, so it's not really a negative point for me.
The endless power and flexibility of the engine. The comfortable and tasteful interior, and the large and well organized cargo area.
Only has one cupholder, and it's useless. Would have preferred a transmission if it were available.