To all you guys that voted Ford GT - have you ever driven one?? I drove one for a weekend and it was not much fun. It is way too hard to see out of, the doors are a huge Pain and the stock exaust is very quiet. After spending a weekend with the car, I really have no interest in driving it again. My boosted NSX was more fun.
So, my vote is F430 or 360. I have driven the 360, and been on a racetrack as a passenger in a f430 several times. Both are incredible cars.