[Perfectlap]

If you plan on doing more than 10 autocross a year you may want to consider getting a set of Kumho Victor Racers. AutoX is very harsh on your tires, it will subastantially lower the life span of your tires if they are doing double street/autox duty.
on my old car I ran a set of Azenis for Summer and then went back to the inexpensive Kuhmo Supra's. The Supra's are adequate for street but absoulutely horrible for Autocross. Sidewalls way to soft, but a nice ride.
I have to change my worn out Conti rears now, I'm leaning towards the Pilot Sports.