Trouble picking out a SLi gaming board :(

Hello,
I'm looking to upgrade my mobo, I'll be using an AMD Phenom II X4 955 Black processor, 4x 2GB DDR3 sticks, and 2x Geforce GTX 560 Ti cards which I would ideally like to run in 16x16. I will be using this box to run 3-4 monitors for high-end gaming, potentially even with surround software for shooters.

I have been looking for a few hours now and seem to be walking in circles, way out of my depth. I could really use any tips or pointers at all! Thanks in advance  

Oh almost forgot, my budget is around £100-£200, the cheaper the better, unless the more expensive boards are really worth it!

Thanks in advance  

Ed