Just regular A/S? Or summer?
I've become a big fan of Continental's Extreme Contact, Control Contact and Sport Contact line of tires.
Usually they're much cheaper than the Michelin's that they usually rank neck and neck with and have a decent warranty on them.
A/S; Extreme Contact DWS 06
Summer: Extreme Contact Sport
The comparable Michelin Pilot Super Sport is $337. That Extreme Contact Sport is $272. Both are 4.5 star rated and both have the same 6yr/30k treadlife warranty.
Tire rack doesn't have either in the 17" size, but I'm not sure if that means the tire isn't made in that size.