There are some alternatives to the Michelins and Contis. Check
Tire Rack - Your performance experts for tires and wheels and
Discount Tire, Custom Wheels, Truck & Car Rims | Discount Tire
Tire Rack has local people to mount and America's/Discount Tire sells both over the internet and has local stores.
I tried the Nitto Invo. Nice tire, odd tread, but rides smooth and VERY quiet with good performance at less than Michelin, but.......they wear out really fast!
I was checking the Hankook Ventus V12 Evo K110 people seem real happy with it according to the reviews.
BTW nice car! 