That's easy- Ford Foci and Civic Type Rs for D class, Nissan 300ZXs and Imprezas for C class, Evo 8s for B class, Skylines for A class, Huayras for S class, and Stellas and Ramis for R class.
Thanks for the advice on how to win, but what about the fact that I scare off a lot of people when I try to pink? I have about 240,000 street cred and am at level 234; I think that I might be too intimidating for that to work against a lot of people. Do any of you have problems with that?