Don't waste your budget on a microATX when it's not necessary.
I suggest the ASRock z77 Extreme4 or its ASUS and Gigabyte counterparts, whichever you prefer.
Get the 7950 Vapor-X. You can't go wrong with it.
Drop the PSU to 750w if you're gonna SLI/Crossfire. 850w is only needed for 7970 GHz edition 2-way Crossfire.
Good SSD models would be Vertex 4, Samsung 830, Crucial M4, and Plextor M5S. Your pick.
Everything else is good to go.