Zipp 303 is a fine wheel, as is the 404. I would get the Shimano 7950-24CL wheels, as they are the cat's meow. Lightweight (especially the rims) and all around goodness and robustness...they don't fail. Bontrager's own Race-XXX-Lite are also good carbon wheels if just have to have carbon. Suitably light and stiff, but I still favor the Shimanos. They ride so nice. I own both.