I don't think anyone is really spending all that much time "worrying" about your "little 'ol ($$ in upgrades) CS car," just suggesting that you might want to come play in Y. I think the Hoosiers are a terrific idea!
Run wherever you like. I am certainly not suggesting that you shouldn't run in X. As JJ said, it is the correct class for the car, but an experienced driver in a well-prepped car (like you) might enjoy the challenge. Seriously, I wasn't trying to push you into Y. :)