Ok well I would answer your questions however I find your build could be improved by going with "some" different parts... Lets see what we can do:
The i7 930 is not barely ever required for gaming, only when running two or more high end graphics cards such as 5870s. Considering this you can pick between a P55 or an AM3 build. These would save you a lot on the processor which would allow you to spend more on the graphics cards.
ASUS M4A79XTD EVO AM3 AMD 790X ATX AMD Motherboard http://www.newegg.com/Product/Product.aspx?Item=N82E16813131402&cm_re=am3_790x-_-13-131-402-_-Product
I'm also not sure of your stance on USB/SATA 3.0
AMD Phenom II X4 955 BE 3.2GHzhttp://www.newegg.com/Product/Product.aspx?Item=N82E16819103674&cm_re=phenom_II_x4-_-19-103-674-_-Product
Also that graphics card uses more power then the 5850 however now you can afford a better graphics card.
ATI HD 5870http://www.newegg.com/Product/Product.aspx?Item=N82E16814150476&cm_re=5870-_-14-150-476-_-Product
I don't think you are able to edge up to the $700 5970 though. If going with this card then you may think of XFiring it later in which case a 790FX motherboard may be recommended to enable 16/16 XFire.
Hope this helps.