Ok to be honest the price difference with those 2 cards its huge, consider getting on the sweet spot. Get the gtx670, better than the 7950, it has only 5% less performance difference with the 680gtx and costs around 100dlls less, my 670 runs gw2 on ultra settings + supersample on, at 60-70+fps, sometimes gets over 100fps, since my monitor its only 60hz i had to turn vertical sync, to much fps was causing screen tearing. hope this helps.
I'll second Dnx's mention of the GTX 670. In terms of wanting a quiet card, I'd look at at the ASUS Direct CU II cards. They're well known for running quiet (as much as a high-end GPU can), and are excellent overclockers as well. The GTX 670 model will set you back around $460 while the factory OC'd GTX 680 version (1137 core / 1201 boost) is another $80.
Thanks All for your suggestions. In terms of getting a 670, its out of my price range. $300 ~ was really what I wanted to spend and I figured with some overclocking and 3gb VRAM I should be ok for the next couple of years (esp if I Xfire in a year or two, again because of the VRAM) Cheers.