I am deciding whether or not I should replace my EVGA GTX 660 Superclocked graphics card with a new one as I am doing more and more video editing on Sony Vegas. I looked at the R9 280 and it has a ton of Floating Point performance, much better than other cards. I am totally open to suggestions for other cards and solutions, like getting another SSD or adding RAM, I currently have 8GB at 1600. What attributes are most important for video cards and which one should I go with, if any?