Thanks for all your comments. I had trouble finding any reviews on the CXP21 rims, so I read some reviews on the Mavic MA3 and they were all positive. I think that rim is alittle wider and may work better with 28c tires. Nashbar has an MA3 rim wheelset (sora hubs) for $139. However, they are 32H. I really want the 36H, at least on the rear. I am 165 pounds, but carry 8-10 pounds of commuter stuff on a left pannier. I check the rear spokes every month or so because they have loosened up in the past. Anyone know how much stronger a 36H is as compared to a 32H ? or is the strength more in the quality of the wheelbuild ?