Agree with batuchka. Your build is almost exactly what I would have recommended based on your budget/usage. You could spend a little more to get an 890GX/FX motherboard, but there's no real reason to do so.
If you're overclocking, you will need an aftermarket HSF like the Hyper212+. It's a good value cooler. If you find the fan too loud, you could always replace it with a different one.
And the chart batuchka linked indicated 509W total system draw for a 6950 CF setup. But the XFX 750W PSU is a very-well reviewed unit, having more power isn't a bad thing.