Review on Build thanks!

Mobo: I'd swap it for an ASRock 870 Extreme3. You'd save $60, and you won't lose anything important. 16x/16x Crossfire isn't really important, as it's only a 3-4% performance difference, yet costs around $50. It only has a real world impact if you're using dual 5970s. After that, Crossfire does not scale well past two cards. It's completely worthless to get a board with more than 2 PCIe 2.0 slots because the added cost of the third/fourth card doesn't match the performance you get from it. In addtion, MSI isn't the best quality. Neither is ASRock, but it's quality is significantly higher.

RAM: The sticks you have are alright, but I'd consider the G.Skill Ripjaws 2x2 GB 1600 mhz CAS Latency 7 for a little more. They'll be a lot better for overclocking. Either set would be good though.

PSU: A decent choice, but the Antec Earthwatts are so much cheaper right now for roughly the same quality. The 750W version is $61 after promo and rebate, while the 650W version is $50 after promo and rebate.

Optical: There is no reason to pay $25 (with shipping) for an optical drive. Get the cheapest one you can find to save some money, in this case $9.

GPU: Now that I've saved you $70-100 on the board and PSU, upgrade to either the HD 6870 or HD 6950 (which with a BIOS change is a 6970).

Don't forget to check for combos.