Check out TireRack.com and the comments & user reviews... they are always better than the tire manufacturer's marketing department. Also compare the ratings to what conditions you drive in (i.e. Floridians probably worry less about snow handlling where as I am in upstate NY and need a good snow handling)
http://www.tirerack.com/tires/tires....nSpeedRating=R
http://www.tirerack.com/tires/tires....nSpeedRating=R