This site http://nhtsa.gov/cars/testing/...s.cfm lists has lots of tire info. including traction rating, temp rating and war ratings for many different tires.

 

You can find the same information in the spec sheets for the tires, available on the websites of tire retailers (like the Tire Rack or Discount Tire) as well as on the websites of the tire manufacturers. You'll probably already be looking at the retailer websites anyway, to get an idea of prices...