hello. im currently looking to ugrade a card in my office build. currently i am running a seasonic 600 watt psu, with a fx 4170, and a gtx 550ti. someone was telling me that my cpu was holding my card back, but i know better than that. i will be gaming on a 720p resolution (1366 x 768)...for now, but may get a diferent screen later. i want it to be a 2 gig card, and more performance than what the 550ti provides, while keeping the budget at $200. i wasa thinking the gtx 480 (1.5gig i know)..the 560 ti 2 gig, the 650 ti 2 gig, or the 7850 2 gig. any other ones are welcome for consideration. thanks for all your help