Hmm, it's been a while since I bought a car...it was the Toyota Levin BZ-G. The best part about it is the 6-speed tranny, so I'm going to make a hybrid out of it someday. Since I've got about 500 cars, I'm usually racing the ones I only used a few times.
I bought the '68 2000GT long ago, and it's not the fastest thing out there, but the fact that it's the long-lost cousin of the Supra is rather neat. It's also very rare, and looks a little like a Ferrari Daytona.