I got a HD 6950 and I run FFXIV on on the following settings:

Windowed -1920x1080
8x CSAA
General Drawing Quality - 10 (max)
Background Drawing Quality - 5 (max)
Shadows - Standard
Texture Quality - High (max)
Texture Filtering - Highest

AO and DoF - Off

With these I get 60fps out in the field and in Ul'dah 40-45fps. You can get a lot better fps though if you do this:

http://www.techpowerup.com/articles/...ng/vidcard/159

It basically gives the HD6950 the same performance as the more expensive HD6970 by unlocking the shaders. The HD6950 has two BIOS settings which you can switch between just by flicking a switch. One you can mod one you can't so I have the HD6970 settings on one (which did make a big difference) but I am running the standard BIOS atm as cooling does become and issue with FFXIV running them and fan noise was annoying so I am awaiting some extra cooling before I run the HD6970 BIOS full time with quieter fans.