You can give the Michelin Pilot Super Sports a try. I know they aren't a drag radial, but you can get them a bit wider than stock, they SHOULD grip a little better than the factory tires according to the reviews, and they're much safer in the cooler weather. If you want something more aggressive, you can try the Toyo R888's, but the Michelins would probably be better in the cold. Honestly, the P-Zero's are pretty good street tires.