I second the idea of test rides at a shop. There are differences in seat height, track width, and cockpit size which may be significant to you. A test ride will tell you a lot that you can't get from staring at specs in a catalog. No matter what some people, even dealers, will say, weight does matter. Not a pound or two, but sometimes I think Sunseeker makes their frames out of an alloy of cast iron and depleted uranium. Even their aluminum frames are heavy beyond reason.