I upgraded from Mavic Ksyriums to Easton Orion II's recently, and think the Easton's are the best quality wheels I've come across. They spin forever, the bearings are so smooth and free, plus they are lateraly much stiffer than the Ksyriums (Equipe, so steel spokes not ali), but much smoother ride; nice and light and climb and sprint really well.
I'd go with the Easton's just because I think they are a quality wheel maker.