While slightly dated,
Hottest Autocross Tires for 2011 - Autocross.US Forums

First question to ask is if you want to be the fastest at any cost, or most bang for the buck, easiest to "get-there, race, and get-back-home".

Fastest: A6
I used Z214 C71 compound last year and they were great from the first run, but didn't last any longer than A6s (about 1 season, 1 driver, about 15 events, 8 runs/event, ~50 sec/run).

I'm convinced you can be competitive and still get a lot of life out of the tires if you drive smooth and smart (not over-driving corners).

And get the camber bolts for the front, and keep your tire pressure 36-40 psi.

Mike