I asked a similar question regarding tire selection for daily street driving and track/autox use. Many recommended R888's. According to SportsCar magazine, the magazine for SCCA members, i think it was January's 2008 issue mentioned Bridgestone had the most wins of all other tires for the SCCA races ending the year 2007. Look at the Potenza &/or g-force series.
Furthermore, Michelin makes a good track/street tire with good treadware called Pilot Sport Cup. The last autocross race I did a guy in a 2007 Boxster set the best lap of the day in his class with Michelin PS2's. Lastly, Yokohama Advan Neova AD07 series I hear are decent too but I have not tried them yet. Good luck
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