Thanks for the links they have alot of great info. Can I ask why you like the mobo you advised over the rampage 2. Is there any thing you could req for my 3d render system that would really put it over the top?
The reason I don't like the Rampage board is that the main feature is that it has 3 PCIe 2.0 slots at 16x/16x/8x. The third slot is useless. Crossfire/SLI doesn't scale well past 2 GPUs. The two slots at 16x/16x is alright, but it only amounts to a 4% increase over 8x/8x. This is only noticeable when Crossfiring 5970s, which is just a waste of a lot of money.
In addition, it's missing a very vital features for a high end board: USB 3/SATA III support. So in a year or two, the board would be obsolete. Which isn't good for a $350 board.
Everything you've got in the build is already extremely powerful. There is literally nothing I can think of that would make it better.