I really like my Michelin Pilot Sport A/S Plus tires on my Crossfire. They're pretty grippy for all seasons, and quiet too. I've put 12K miles on the car since December and still have a ton of tread left.

I've also got a set of Hancook Nexus V12 tires that the car came on but obviously weren't suitable for winter driving up here. I'm going to mount them on a spare set of wheels soon hopefully.