Good video game play and good graphics play are not neccessarily the same, that's why they make video cards specifically for graphics work. If that's what this computer is solely going to be used for, that would be your best bet. More reliability, better driver support.

That being said, my computers have always done both. Getting a high-end gaming card has always worked fine for me. The last I knew, AMD's 7970 was at the top of the heap, although that tends to change every few months or so.

I wasn't aware that AMD had CUDA support, as CUDA is/or was a proprietary NVDIA technology. Nor is CUDA necessary - at least with Vue- as I've only used AMD cards since Vue 3.5 and they worked fine for the most part. As Bruno says, if you're going to use a gaming card, I would check with E-on and get the best one they reccomend that you can afford.