Please god no Skylines. No Scoobies. No other typical street racing cars, in fact. We have a Ferrari / Porsche hybrid We have an F1 car, a Mini look-a-like, and pretty much everything in between, in one form or another.
I think that there's nothing wrong with the number of cars that are currently in the game. If people spent as much time learning how to drive them properly, as they did suggesting new models, perhaps they wouldn't be so quick off the mark to do the suggesting!