A few suggestions.
- Get the low profile version the Vengeance RAM.
- Drop the H80. Closed loop water coolers are matched and even sometimes outperformed by high-end air coolers such as the NH-D14 and Silver Arrow. It's not worth the extra cost.
- Get the Vertex 4 of Samsung 830 instead for an SSD. Whichever you find cheaper.
- If you're thinking Crossfire in the future, up the PSU to 750w so you won't have to upgrade that anymore when you do.
Everything else looks great!
Are you sure you want the infamous Windows 8 though?
Huh. Looks like I got beat to the punch. Granted, it's definitely your choice on everything, though the only reason I put in 16gb of RAM is for the video editing and the like that was mentioned. You could probably do just as well, and get completely under budget, by switching to only 8gb. I also switched the case, got the TX650 PSU, a GTX 660 TI instead of the 7950, and put in the NH-d14 for the CPU cooler.
Also went with Windows 7, but since it's a roughly $10 difference between the two price-wise, your choice.