Intel build. SLI is nice and all, but according to the mobo you chose, when both PCI express x16's (one of which only operates at x4) are taken, all the PCI express x1 slots supposedly become unavailable. Which to me is sad pants. With your intel build, you got better expandability in the future, I always say one awesome card is better than 2 good cards. Who knows, what if you want to add an awesome sound card in the future?
However, if your thinking raw power right now, and could care less about what I said, then go for the AMD build.
Also, the card specs confuse me. It recommends 500w or higher, yet...also wants two 750w 6 pin PCI express connectors? Maybe someone else can answer that, how could you recommend a low watt power, yet also recommend a connector at a wattage higher than the power supply?
Some of the budget is allocated in the wrong areas. Looking at it that's just about a 1100-1200 budget. You should be able to get SLI 560 Ti's or CF 6870/6950 if you dropped the SSD.
Check out my build guide for 1200-1500 in the siggy. It'll help a bit I hope. If you don't plan to overclock drop the 2500K to a 2400. You don't need the 2500, that's 20$ more than a 2400 for barely any more performance.
Also, what makes you get a 2500 then? If your not OCing at all, might as well save some dough and get the 2400. That's 20$ right there. And Why that motherboard? It'll restrict any upgrade path since you only get 1 PCI Express 16x 2.0, Get the G45 or G53.
That AMD motherboard DOESN'T SUPPORT SLI!!! Go with the Intel build, but get a 2500K instead, and a better PSU so that you can crossfire the 6950 latter on. You can go with the Antec 300 case case to save money which is better than going cheap on the PSU.