nice that u waited on the power supply and the vid card, cause sometimes the vid card of today will have an extra 4 pin molex power connector.
U def need a PCI express card
and a 600 W psu will be enuf.
See if ur case builder has a 600 W recommend on their site.
What game u gonna be playing? how about SWG:empire divided? i been playing it fer 3 yrs