I understand where Colin is coming from, and with the software you are planning to use, it is fine too. Any modern graphics card will do; BUT...
Adobe is moving more and more into the direction of using GPU acceleration using their Mercury Graphics Engine in their products Some of the functions in Photoshop CS6 definitely use this technology. Premiere Pro and After Effects heavily use this technology as well. If you are considering moving up to full-blown Photoshop at some point, you might want to check the Adobe website for recommended cards; if your card is not on the list, it may not work as well as the approved ones.