One wheelset? That would have to be ol' school Mavic Cosmics. 38mm deep, 16 spokes, rock-solid aluminum rim. Not particlarly light, but aero, durable, and versatile. Clincher or tubular - doesn't matter to me. I've got lots of both. The best part is you can often get a set off ebay for $200 or less.
Shamals or Ventos would also work.
Shamals or Ventos would also work.