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900w is overkill. Xfire/Sli performance is dependant on game still. One monster card is still superior to 2 mediocre cards. You are not going to be using 667/800 for i7, these are ddr2 speeds. i7 is DDR3 exclusively and triple channel (3sticks of Ram) as well. Are you running a 64bit o/s or just 32bit? Pointless to go to high end system and run a 32bit o/s. You just can't use enough RAM to make the most of additional performance available.
Are you planning any RAID setups for the HDD's or just two separate drives? Some of the bigger 1tb+ HDD's are offering raptor performance simply because of the data density across the platters.
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