I'm running Hankook Ventus V12 evo K110's on my summer wheels and am very happy with them. I've only driven on the street with them however, no track or anything. For a cheaper tire though I think they're pretty good.
This is what sold me. http://www.caranddriver.com/reviews...mparison_tests/hankook_ventus_v12_evo_page_10
This is VERY helpful guys, THANKS! I think I will give these a shot if the budget allows. Otherwise I will have to get a Dunlop Sport SP shaved down to match my old one that has a 1/2" bolt in it...