You typically buy an nForce if you want to do SLI. Unlike Intel with its X58 platform, AMD has no chipset that is capable of supporting both Crossfire and SLI; it's an either or situation. The other reason is simply because one prefers nVidia's built-in motherboard graphics to AMD's. I'm just OCD about matching my parts, as I believe it promotes smoother meshing of components. It's all in my head though, don't mind me.

Go ahead and get the board, there's nothing wrong with it. I myself built my new AM3 rig with an ASRock, and it's a superb motherboard. Nice features, solid performance, and good layout. Also fantastic onboard audio, USB3.0, and SATA 3.