I may be buying a base-model G5 soon and many posts have strongly recommended upgrading the graphics card to at least the ATI Radeon 9600 XT instead of the standard NVIDIA GeForce FX 5200 Ultra. I work as a graphic / Web designer, play no games, and the only video editing that I do is in iMovie. I use two 17" Apple Studion displays. Would the GeForce FX 5200 be sufficient? Where would I notice any difference between these two cards? What would be the disadvantage to staying with the standard card? And the advantage to upgrading? Any advice would be appreciated - graphics cards represent a large gap in my computer knowledge / understanding.