I am going to attempt to build up a new wheels for my M700. They are the final piece to completing my Deore LX M580 groupset on that bike(I have the brake levers too, but don't use them). I just picked up a very good condition used M580 11-32T cassette off of e-bay. Until then I need a way to run the 9 speed cassette on the bike. The M290 free hub is narrower and limited to 7 speed max, so I picked up a NOS MC18 8-10 speed free hub off of e-bay for great deal.
Everything fit just fine late last night, so I am able to reuse my older worn wheels that came on the M700 and not have to swap wheels with the Delta V when I want to ride it.