I had a good look around when I wanted tyres for the famous ND/SS 2010 Cadwell Track Extravaganza.

I ended up with Pilot Power CT2's, which iirc are currently being replaced by Pilot Pures (I think Chaz said).

It was a choice for me between the Pilot Powers and the Pirelli Diablo Corsa Rosso 3 (or some combination of the previous words).