I've pretty much nailed everything down with this one, but I'm wondering if that PSU is going to be enough to run the two 6950s, an overclocked system, and a liquid cooling system. I have roughly $65 extra to play with, so if a larger PSU is needed, I'll have to keep it within the $215 range. Thanks for the help, guys.
Save some cash and get that, you'll save 20$ for basically the same performance.
That PSU is more than enough, you could save some, if you wanted, and go with an XFX 850w. 110$ AR. Also XFX is a better known name under the Seasonic brand.
If you want more evidence to sway you, please read the review done recently on Newegg. Almost not enough power on the rails to power CF 6970. Expect problems then with the 6950 CF.
You don't need water cooling that's for sure. What exactly is your loop going to look like? I mean 2 full cover blocks are practically 100$. So if you plan on WCing your cards, expect some cash of at least 500$. I also think that better spent money would be on CPU's not WCing. Specially since you don't need it anymore.
Look at my site for advice, referring to the 2500K.
The loop I'm going with is just for the CPU for the moment. Eventually it's going to be expanded to the two vid cards, but for now it's just a basic CPU loop. I figure with the ambient temps on the 6950s (planning on flashing to 6970) the liquid cooling would help when the CPU is overclocked. Plus the aforementioned expansion. I read that review and it's unsettling. The one thing I always forget to research is the PSU. In the past, I've put together single card builds, so it's been easier.
So your still planning to go with the AMD build? I can't persuade you but if you got a 2500K build it'd run cool and OC to 5.1ghz on air. Plus WCing isn't needed anymore as 32nm moves on. The stock intel cooler can get the 2500K up to 4.6ghz.
If you still plan to move ahead with the AMD build (which I wouldn't suggest as WCing those kinds of old builds are just stupid when current ones don't need it and money could be spent else where. Here is a loop that is cheap and most 1st timers or most WCers use for cheaper but still good performance.
The cost you put asside of 500$ would be me getting 2x 6850 EK full cover water blocks + 1x LGA 1155/1156 Heatkiller 3.0 + MPC655 (something like that) Pump + tubing + 120.2 Swiftech rad + 120.3 Swiftech rad + microres + all required parts.