I've used the fulcrum racing 5 rims and the Cxp33
240-265lbs
I've got over 4000 miles on a Fulcrum Racing 5 rims that came stock on my Specialized Roubaix. I swapped out the back wheel for a 36 hole Mavic CxP33 over a 1000 miles ago. I went to 36 spokes on account of the powertap hub.
I rode hard enough to crack the frame and the only wheel related problem I've had is a loose spoke. I'm starting to think the 140 pound guys at the shop are a little over cautious when it comes to reccomending wheels