I would upgrade the RAM to 1600MHz it is like a 2 dollar difference, and I would get a COOLER MASTER HYPER 212 EVO instead of that other heatsink, It is pretty much the same price but is a lot better. You can bring that 750W power supply down to a 650W power supply and you will have no problems because you will still be 100W over your limit. I would get this motherboard instead of the sabertooth because you do not need that good of a motherboard for a system like this. http://www.newegg.com/Product/Product.aspx?Item=N82E16813157271
Other than that everything looks good, I pretty much have the same setup as you and it runs battlefield 3, Skyrim and pretty much every other game on ultra settings with no problem.