Came into this thread planning on suggesting Nitto Invos. I've seen some Corvette and Viper guys run autocross (for fun, not national contenders) on Invos and do pretty well on them for having a good bit of horsepower and limited competative driving experience. Never driven them myself or rode on them though.
Edit: My Michelin Pilot Sport 2 tires are hands down the best tire I've even driven on, and probably have something in your size, but may be out of the price range your considering. I only have mine because of the great deal I got on them.
Last edited by 01FR500; 08-01-2010 at 06:47 PM.