I ran Super Corsa's (SC1 front and SC2 rear) on my 996 last year. The rear didn't last as long as I wanted but the grip is outstanding, probably why they are so popular. I have Bridgestone R10's at the mo and the rear seems to be wearing much better without any as yet noticable loss of grip. However, they haven't seen a hot TD or race day yet.
Around £50 cheaper the the Pirelli's aswell.