Yokohama's are good but darn expensive. Same for most anything made by Goodyear. My suggestion was gonna be a set of 245/45 Azenis from DiscountTire for < $500 new. Then I found this ad. $650 for used V710's AND wheels. (I think the Evo wheels work for us). I mean just take it easy til you get the hang of race rubber n all.
http://sccaforums.com/forums/thread/274614.aspx