Dont bother with dual SSD's if you plan to RAID them, it doesnt see much gain and you may loose TRIM. Other than that, you really dont need a 1200W PSU, an 850W would be just fine and dandy.
The CPU is overkill, but if you want to go for it, then do so. But just a bog standard I7 4790k or the 5820x would run your 2 gfx cards on full bandwidth (which they wont use anyway).