You'll need 8sp, the M900 where designed for 8 speed, though not Compact Drive so you'll be limited to a 12T smallest unless you bodge it with a 1mm spacer, though mine eventually chipped the freehub body where it screws in)
They are a top set of wheels, my favourite rims (they are the best Araya made) and better than the Mavic 231's by a long shot. It would be correct for the age too.
The XTR is M960 then, early 2000's
32 is quite low if you do a lot of road work. But see how it goes. Grab any of the SRAM/Shimano 12-32 or 12-34 depending on what you want.
Give it a go.
Which area are you from ?