Im Running these on my Company Car ( XR6 Turbo)

http://www.federaltyres.com.au/ss595

and they are holding up pretty well considering the cars weight and the KM's I do on both gravel and tarmac. Got 40,000 km out of them so far and still a few mm of legal tread left. I started using them after I did a V8 drive day at Barbagello and they ran them on the Vk V8's we used. From memory they are quite reasonably priced too.