2002 Pontiac Grand Prix SE 4dr Sedan (3.1L 6cyl 4A)
I've had this car for over two years now and have had no problems with it (which would be expected for a car that's only two years old!) It still drives like it did when it was new and I'm amazed at the highway gas mileage! We just got a 2005 Subaru Forester and while I love that car and really like the all-wheel drive, my Grand Prix is still the car I prefer driving.
The large amount of drivers seat space. I'm rather tall and I've never felt cramped. The engine is rather nice, too. It feels fast, even though it's the base 3100. The dual climate control is killer, too.
I'd like more useful headrests, but most other improvements I'd have would have been solved by adding options or stepping up to the GT or GTP.