ok, heres more or less what im looking for, the game does not have to fit all the criteria, but should fill as many of them as possible.
1) HUGE amount of cars (updates up for downloading on pc version would be best) (cars themselves MUST be realistic, i dont want to be in a viper gts finding a c5 vette racing ahead of me like it was more then the gts's equal) also, alot of old cars would be nice, but most specifically, a game where you can download updates.
2) power bands and wheelspin and all that stuff is realistic, traction and downforce are very realistic for car, etc. (ESPECIALLY HANDLING)
3) the shifting for each car is very realistic
4) customization. tuners and "relative rice".
5) online play
6) many real tracks, many non-real tracks, multiple types of racing (at least stock and le mans, if not more). drag racing would be nice.
NOTE: these are not in the order of how much i want them.
thanks!