Mousemonkey :
CPU and PSU info would also be useful along with budget if there is one.
not interested in resolution any higher than 1920x1080.
CPU = core i7-940
Budget = depends on my value calculation, i got these cards for free so don't have any concept of what it will take to replace. They seem to be fast enough for what i throw at them, portal 2, GTA IV, etc.
Once i know what will give me same power from 2011 cards i can look up and down the rest of the charts to see what i get at different $ amounts. I am not very price sensitive.