Go to tirerack.com and you can do 3 neat things;
1. select a size and get all the options from say 8 suppliers by price/performance/etc
2. get the real actual dimensions of the tire and compare it to your old measurements from an original tire ( use inflated old tire). This is key to avoid changing ride height, getting max road thread for the same overall width measured at the max cross-section and the latter for avoiding rubbing wheelhouses....not all tires the same size have the same dimensions!!
3. get actual buyer feedback on the tire,,,some of it ain't pretty.