Hi there.
I have just recently done a gfx upgrade myself.
I originally went for a nv 560ti with an after market cooler and overclocked as standard. That card was ok for 1 month then it died. So as I had a bench mark on the 560ti for fps I got a refund and went for the Vtx 6950 2gb as it was the cheapest 2gb card at £200. The 560ti was £180. For £20 difference there was enough fps increase to easily warrant it.
Check out my previous discussion about this.
http://forum.1cpublishing.eu/showthr...t=26160&page=2
As you can see from the above link there is a 7fps difference when fully maxed.
Also I have just done a full reinstall of Windows 7 ultimate 64bit and the fps on black death has gone up from 31 to 43.
All I can say is "glad the 560ti packed up".