There is the issue of future 3D gaming - if you think you might do this in the future, NVidia cards are better.
I also understand driver support updates are better.
I haven't looked at ATI's web presence, but Nvidia do some good articles on optimisation.
See here http://uk.geforce.com/whats-new/articles/the-elder-scrolls-v-skyrim-live-stream
I have an Asus 570 dcii bought a couple of weeks ago, I mainly bought it for the engineering I think as it is well cooled
Anyway thats my 2p![]()
http://www.amd.com/us/products/technologies/amd-hd3d/Pages/gaming.aspx