2006 Pontiac Grand Prix GXP 4dr Sedan (5.3L 8cyl 4A)
Much much better than I expected. Tried ALL midsize cars, both foreign and domestic and this was the clear winner. Fast, quiet, handles excellently at both high speed and low. Tracks very well. Excellent stability system and the brakes drag you to a stop faster than an aircraft carrier landing deck. If you have a bias against the Pontiac name, I suggest you try this car. My Saab-loving wife drove it once and decided that this was the best car going for the price -- 27,600$ with leather and airbags and a few other toys.
Driving dynamics, Heads up display, excellent mpg if you baby it, holy terror of acceleration if you hammer it.
Put fancy crystal-lense headlights, folding mirrors. That's it.