The Bridgestone Potenza RE-11 continues to be a strong contender in the Extreme Performance Summer category of tires. The Potenza offers plenty of dry grip for autocross or track events yet still enough road manners and wet traction to use as a daily driver.
I recently attended the Bridgestone Racing Academy just outside of Toronto. The Van Diemen formula cars are equipped with the RE-11 for both wet and dry conditions. I was impressed by the durability and grip of the tire after each car was put through roughly ten or so twenty minute sessions per day.
The Potenza is currently offered in over 30 sizes. Be sure to read consumer reviews and test data for help in finding the right tire for you.