Welcome to the forum. Looks pretty good. Get a 2500K instead, then for a PSU a Corsair TX750 V2 would be good. What's the total right now? You may be able to sqeeze an SSD in, otherwise just grab a 1TB Spinpoint F3. Crossfire is running two radeon cards simultaneously, SLI is the nvidia equivalent.
will AMD radeon HD 6950 work with the Pro B3 Intel P67 motherboard?