I had made a computer for about $550 Can, and I still haven't found an optimal video card for it yet. I heard that some CPU's can slow down the performance of newer GPU's, so I don't want to shell out an extra $50 for wasted power. My CPU is the AMD phenom II X6 1100T, and my PS is 500w. I don't mind upgrading my PS, if necessary, but I want to find something not too expensive. I was looking at the Radeon HD 6850/6870 series, and I'm wondering, are there cheaper/ better alternatives?