I've done a little work on getting the real value a GPU gives you, ie Rands per FPS delivered, as well as average FPS.
In a nutshell I've taken the FPS from each game they review with and averaged it. I've tried to stick with 1920x1080/1200 resolution results since thats what most people will be running. I can add more data from other sites if people want them. For the price of each GPU I have tried to find the cheapest option in SA.
Links for those that cant view embedded images
So basically, if you want the best you pick from the average FPS list. If you want the most value, pick from the Cost/FPS list. Most likely you'll end up looking at both and finding the right compromise for your budget.
For high end cards its a bit easier to look at the Rand/FPS chart, for medium to low end cards, the FPS/Rand chart is easier. Thanks to pada for the suggestion
My best value pick as of May:
GTX670 - killer performance at a very good price
Post any suggestions/corrections (especially price corrections) in this thread or PM me. I'll try update the OP regularly as new GPUs come out or as pricing changes.
Well after all that work I seriously hope it helps someone!
Sources: Guru3d, Anandtech, Hexus, Techpowerup