I'm looking for my first road bike, upgrading from a mtb with road tires. My LBS has a Scott S50 and S30 speedster and a Trek 1.2 and 1.5 that I'm looking at. I'm a big guy at around 340, but use to be around 400 , so I'm a little worried about how the bike will do under all that weight. I've been told that I'll have to get a bigger wheel set. I'm averaging 15 miles-a-day on my current bike and I've been riding steady now for about a month and a half. Having never been on a road bike I don't know if I'm going to want the higher end S30/1.5 or if I'll be happy with the less expensive S50/1.2. The first time I'll ride on a road bike is going to be when I try these out on a test spin. Any recommendation, ideas, comments for me? Thanks!