Hi Gambler, I have sitting next to me a computer I put together for friend and its nearly what you have planned. I have ran CoD and it looks fine to me, the 69xx cards are showing 2 blue lines on the horizon, but those on the forums say a fix from ATI is coming.
I went with the Intel i5- 2500K over the 2600K, cheaper and for gaming its suppose to be as good as the 2600, just lacks some threaders that have nothing to do with gaming.
Motherboard is an ASUS Sabertooth P67, as for GPU, Radeon HD6950, again a bit cheaper, it can be flashed to the same specs as 6970.
Have fun, I love putting them together, the suspense to see if it fires up is quite a rush.