There are about 4 tires that dominate Street Tire Classes in SCCA autocross.
Sadly, everything else falls short.
If you want the best ur looking at either the Hankook Rs-3, Star Spec, Re-11, or Toyo Proxies. Hands down, no other tires really compare for street tire class. Just take a look at the national tour and solo national results.
The RS-3's to me are VERY good and are good priced. I have had good luck with them.
If you want the best street tire for autocross then choose from this list!