DerbyJim said:Michelin Pilot Sports 4 or Super Sports if you're not bothered about Porsche Warranty.
Yokohama AD08R are my Lotus and have been very impressed with those. I have a friend who can get those cheap for those interested. PM me
I've got the 17" Yoko AD08R on mine and very happy with them - tones of grip, hard sidewall and a fair bit quieter than previous Mich Pilot Sport 2 tyres I had. Absolutely fine in the wet, but do get slippery if it's cold (below 6 celcius) + wet together though...when conditions start to get like that it's normally when I tuck the car away for the winter.