If arcade games count, then I'd have to say the Ferrari F355 Challenge with the three screens. I really wish the local arcade didn't take it out, though.
I, personally am into the cars, too. I've got an older T-Maxx with a bad tranny (If anyone has a spare, let me know), and a really old RC10GT with...many issues. My dad's got a brand new Ofna buggy, too.
I recently had a little fun and converted an old radioshack RC to be....more controllable, and much faster. I've got a Losi 370 in it, a Traxxas steering servo, and a Futaba Magnum Junior to control it all. I'll have to get pictures for those who really want them.