don't carry any water, ride naked, poop and pee before you ride, get a haircut.

seriously though, if you get the right parts and go to a shop, you can get a set built at a pretty good price. there was just a thread about it with exactly what nathanc said......probably lightest for the money

Kinlin XR200 rims, 24/28
Sapim XR Spokes
Extralite SX hubs