here is a wattage calculator
to work out the wattage.
always get a branded psu, antec, corsair, seasonic, ocz etc and get at least 80plus bronze rated psu.
i wouldnt get that drive, its not designed for ur standard PC, for $10 more u can get a 2tb seagate
You only need 16mb of ram if you are doing some heavy editing,3d rendering. 8gb would be enough.
And for a few extra dollars get the 4th gen I5 cpu
and a 1150 socket mobo.
not sure id bother with the water cooler, not really needed these days, one cooler to look at cm 212 evo
And id probably get at least 120gb ssd drive.
Hope this helps..