Subject to rotor compatibility (as per MadM above), I'll give a shout for the XT/717 Disc choice; I've been using this (w/the xt 6bolt hubs) now for two seasons. If you're not doing "sweet jumps" etc. () this really is as bullet-proof, durable, AND light set-up as you could want. The Mavic 'factory' style wheels are very nice, and look the business, but you are getting some proprietary parts. The xt hubs, though cup/cone, are (therefore) fully rebuildable/user serviceable, the quality of the races etc. is a whole level above Deore/LX, and the wheels use standard spokes. I haven't had to touch my wheels or hubs yet (they're checked twice/year) with close on to 10,000 kms on them. There's a reason a lot of long-distance touring riders use these hubs