I will second the Hankook V12 for quiet and decent performance. The best part is price. They don't perform as well as the Yokohamas IMHO, but they are much cheaper, last longer, and are much quieter!
__________________
 2007 350Z NISMO #0618: Zerolift | UPREV | F.I. | Greddy | Competition Clutch | Injector Dynamics | Aeromotive | Pioneer | JL
|