Since this is mainly for WoW (which is all that I play) I found one of the greatest things that enhanced my gameplay was two additional monitors. With two additional monitors, you can have a browser open ready to search anything you need to, and on the other monitor you can have any interfaces you need like a DPS meter or what-have-you and it won't clog your center screen.
^+1, even though it makes me angry what I paid for it...
That's an expensive board for "maybe overclocking"
8GB RAM seems Excessive. If you are trying to future-proof on the RAM, I'd go with 4GB of 1600 over 8GB of 1333. It's cheaper and less likely to hold you back if you later add more ram or use the ram in another system.
I would stick with the 6870 from somewhere else. Pick up a SSD with the difference
Here is one I like, but you could prob do better grabbing whatever is cheap on cyber monday. Anything with TRIM support should be fine.