Gee, that's a hard question. I would like to drive an F40, but that's too obvious.
The MX-5, my favourite real-world car that people actually drive, would be a nice choice, too. Oh, and a 2000 Ford Focus; my parents own one, and it's kind of a love/hate relationship. I think the car might drive well, judging by how it feels (however, I have no idea really, as the only other car I've driven is an '01 Caravan, and both for only a few kilometers). However, when I was little, I always got sick in that car on long drives, so I've recently been struggling to overcome my sense of resentment with logic.
In short, I'd like to drive a....Mazda 3, probably.