That's a nice configuration... At least the budget allows it
The motherboard is certainly very capable... why limit the RAM then to just 1600MHz (I have the same RAM for my Phenom II X4). The MOBOs are both similar in capabilities. If you're planning on sticking with your RAM (XMS3) it only supports 1600MHz, which only the Deluxe board seems to support so that ought to narrow things down on that front, unless you change your RAM. I would probably recommend the Corsair Dominator series of RAM with lower latencies.
Regarding the video cards, I would probably go with the dual GTX260. You'll rip through anything for a long time . Though ATI cards tend to save you some money for competitive performance. I mean, in this configuration, getting a 275 or a 2x260 will let you play the latest games in style at any resolution. In light of that, you'll need a solid PSU though, like anything north of 850W in the least to say.
I'd go with the 5850 over the dual 5770s simply because of the hassle of multi-gpu configs mentioned earlier. However, i can say that neither of those GeForce setups would really be worth your money because they are both old and do not support the latest technology, DirectX11