While I have no experience with either boards, I am looking at them andseeing little difference. One advantage that the Crosshair has over the M2N32 is that it has a post code LCD on the back, which would be really cool. IT also looks like a GREAT overclocker. I'd go for the Crosshair if you are financially willing.
EDIT: Plus you get 3DMark 06 with the crosshair.