i've got the M2N32-SLI, it's very good.
Had a few problems when running Linux, but the BIOS update fixed that.
If ** planning to overclock then i do say try to keep the "motherboard" temps below 45 degs other wise it starts to get unstable...
part from that it's lovely !
and both Graphic card ports are 16x , so u'll be able to run 2 graphics cards at full 16 16 speed !