What are you doing with it?
Photoshop alone won't get much use of the GPU, a passive HD4650 or passive GF9600 would be fine, and if they bring out a passive HD57xx series that would be nice. For video it would be more important than for photos.
If you get a better monitor in the future then DisplayPort support would matter more for now, and many of the Eizos currently support DP, so that way you wouldn't need to compromise your setup if you went with something with DP support now.