The Extreme4 does not support Quad Crossfire/SLI. It has the slots sure, but two of them run at x1 bandwidth, massive bottleneck if you tried. The Extreme4 is only good for dual Crossfire/SLI.
So this is essentially an office machine, with the most intensive usage being essentially Microsoft Office programs, movies and web browsing.
You could get away with much lesser hardware.
Core i3, H77 motherboard and 4GB of RAM (Though no reason not to get 8GB, only $20 difference).
HDD is good.
PSU is a no. Coolermaster PSU's, especially their lower end supply's, arent the best.
Corsair Builder 500W. $60 ($10 rebate)http://www.newegg.com/Product/Product.aspx?Item=N82E16817139027
Case+Fans is good
Bit more info on the monitor will be needed.
Why a UPS to protect such a low end machine?
A good GPU for this kind of rig would be a HD7770.