I only use ATI graphics cards.. bottom line is better bang for the buck. If I ever win one of these giveaways this is by far the one I want to win :) Definitely would be a huge upgrade from my current 4870 CF setup.
I have always used ATI graphics cards over Nvidia I don't make much money so I prefer the bang for the buck that I get with ATI. Still hoping to upgrade my HD5870 to something newer :)