Get the 2TB hdd in ncix, i'd get the plextor ssd 256GB, it's better than the ocz vertex, ocz ssds have a high failure rate.
Also for casual gaming, a 660 gtx will do, get a larger ssd.
Get the seasonic 620 modular, the modular one, 620W is plenty for the setup.
This is the modular : http://pcpartpicker.com/part/seasonic-power-supply-m12i...
That doesn't include monitor.
Get the patriot ram, it's cheap, a dual channel kit is better, like 2x8GB ram, the patriot offers lifetime warranty.
I'd get an aircooler, those closed loop watercoolers aren't as good as the high end coolers.
Get the Phanteks PH-TC12DX, it's a good cooler, see here the review : http://www.overclockersclub.com/reviews/phanteks_phtc12...
It comes in different colors.