Once you OC, the only thing you'll likely have to upgrade for the next couple of years is the video card. 8800GT struggles on some of the newer titles a bit. Have to lower a few settings.
I'm assuming your 8GB comes from 4 sticks, if so, to get the best OC, I'd probably just take out 2 sticks for now and go down to 4GB. 8GB isn't really needed for gaming at all.
As far as the board, it's a very solid board. If the cpu is capable of 3.5GHz, the board will get it there.
“What the hell did you expect? Leave Vista under the pillow and the OS fairy would make it Win7?” -El Fiendo
“And Bring Mailman back god damnit, he is the Eric Cartman of TPU” -MRCL