symbiote,
Nascar SimRacing is an excellent game......is best played with a wheel though.
Rfactor is another good one with a wheel. It has open wheeled cars (indy) and alot of other stuff.
Depending on how much change you have, the Logitech Momo wheel is excellent (I think I payed 70 bucks for mine) and the games are now about 20 bucks. ??
You won't be disappointed with Rfactor........I don't know how many people still play Nascar SimRacing and it required a patch (which I cannot find anymore) to play on public servers.
good luck with your decision and have fun