Yampa frame
The Yampa is lightweight personified (or is it itemified?) Full carbon fibre construction with a 190mm spaced rear end to give clearance for the biggest of tyres and rims and still run a full set of gears.
Light weight, you bet 2.8lb for a medium frame and tough too. The frame is available on it's own or with a beautiful matching full carbon fork.
Frame is £1550, Frame, fork and headset is £1950