I would personnaly pick 2 680 with 4gb each not 2gb per gpu like the 690 (more memory is better for high resolution/details) for less money and at the same time with the same level of performance, the rest is ok, that will be one fast rig for sure !!!
***You should really pick a nice soundcard if you plan on headset gaming however on amplified speakers that's less a trouble (but that will help with some high-end speakers too)
I plan to use G35 headset so left out soundcard..Is this a mistake?