I would agree a 8 core would shine nicely on that motherboard. Unless of course you are on a budget. Be sure to add your dvd back into the list, I noticed it was missing on Jerimiahs's link. I also agree that a step up of the PSU to 650 or even 700. With a 8 core cpu and that monster video card you have 305 watts tied up just with those two. Some other thoughts to consider....The memory you selected is 8 gig (2x4) Which will work. However, later on you may want to max the memory then you would have to ditch the two 4's. If you can afford to go with 2x8 that would be better. Something to think about.
Furthermore, the 8 core CPU supports 1866 DDR3 memory which is faster than the 1600's. Also try to get a lower cas 9 or lower. With a gaming rig you need that extra kick. It will allow you to achieve that 4ghz turbo and higher. Be sure to read up on the motherboard's QVL of memory it supports. I doubt you will have issues, but you never can tell.
Tip: On the computer case front accessories panel...be sure to route the cabling for headphone/mic away from other cables USB, power etc if you can. It's common to get a EMI and static through the headphone/mic as many of the cabling for these panels is not shielded very well. It's really a delima these days as companies cut corners as much as they can to save money and the end result is your headphones/mic that sounds like a CB radio. People tend to just get a couple Y adapters for the rear phone/mic jack. Unless of course you are using some kind of partial setup with the HDMI or Optical SPDIF to an external source. Anyway, goodluck with your new system.