While I appreciate Tony C's suggestion, my needs are more for street/highway use rather than autocross/performance driving. The Tirerack testing on the Kumhos vs. the Sumitomo HTR-Z (the predecessor of the HTR-ZII) was about equal:

http://www.tirerack.com/tires/tests/testResultsModel.jsp?tireModel=Ecsta+Supra+712&tireMake=Kumho

and the Tirerack customer surveys indicate that the HTR-ZII is significantly superior to the prior HTR-Z, and slightly above the Kunhos, except for tire wear:

http://www.tirerack.com/tires/Compare2.jsp?compare=true&partNumber=&make=&model=&price=&width=225%2F&ratio=45&diameter=17&sortCode =&speedRating=&qty=&stockMessage=&type=T&URL=&newCompare=true&AddToUser=true&manufacturer=Kumho&manu facturer=Sumitomo&startIndex=0&sortValue=1&compareList=0&qty_245WR7ES712_=4&compareList=1&qty_245WR7 HTRZ_=4&compareList=2&qty_245WR7HTRZ2_=4&qty_245ZR7V700_=4&qty_245ZR7V700HC_=4&qty_245ZR7V700432_=4