Why not 680 x 4? Is the 680 not 4 way SLI capable?
Also, just because you can fit that much RAM doesn't mean you should.
Having tons of RAM isn't always beneficial, especially not tons of 8 GB sticks which often come with problems anyway.
Also, way too much Corsair for my liking. Might be better to use an Enermax PSU instead.
I think I would rather have a high end Lian Li case instead of a high end Rosewill case too.