I have the Guru 50s from PX. They're a fantastic wheel, really light but you pay for it with a bit of flex if you're big and really hammering. Fortunately I'm little and can't pedal for toffee 
http://www.planet-x-bikes.co.uk/i/q/WPPXPRO50GURU-RAD-SHI-TUB/planet_x_r50_guru_team_edition_carbon_race_wheels___radial___shimano_sram___tubular
These ones
They weren't bad in the wind either.
Edited: 16/08/2012 at 22:03