Down to about 250 now, give or take a pound. At 265 I started riding on a Bontrager Race X Lite Aero that was a couple of years old. 16 spoke, all flat. You know, the type of wheel people tell you to not ride at this size. Hasn't been trued yet and only broke a drive side spoke in a crash. Oh yeah, 5,000 miles probably, and not a single crack in the rim either. So I don't care what people tell you about wheels and being big, take most of it with a grain of salt. Oh yeah, and I have been riding on some Bontrager carbon wheels to, not a single problem.
Now with that said, I ride the hell out of wheels. Mavic, Easton, stock cheap wheels, custom built, 32 and 36 spoke, I tore the hell out of them. Everyone was called "bomb proof" only to fail miserably in less than a 1,000 miles. My experience, so once again, only take that with a grain of salt.