Thanks, I've been lurking for a long time.
I'm up to 480+ cars unlocked, 55% complete. Started with the '91 Lexus SC300, which I'd use to win and rewin the Turbo cup. This gave me enough money to get an '89 Mazda Miata which won a bunch of races, even winning the Japanese 80's cup to unlock the Mitsubishi HSR-II concept. This one was my horse for the longest time, and if I was ever in need of cash, I'd just run the HSR-II in the two-lap Seattle course to win 10k over in the Tuning cup. But I just won one cup after another and methodically began unlocking cars.
The cars getting a lot of miles at the moment for me are the CLK Touring Car (for Nurburgring and the Touring Car tournament), the CLK-GTR Race car, a black Toyota GT-One LMP, and a yellow/black F1 car.
I need to go through to all the dealers and just buy a bunch of cars, especially since it will make combing through the Used Car lists a lot easier.