So I have a custom PC with 8 gigs of RAM, a Radeon HD 6950 and an AMD Athalon II x4 620 2.6ghz. I mostly use this computer for gaming with a bit of video editing thrown in on occasion, though I mostly use my mac for that sort of thing. I'm really looking to upgrade in order to get better performance during gameplay (I play at 1920x1080), but I'm not sure which component to upgrade in order to get the most for my money. My budget is around $200. Any suggestions would be greatly appreciated. Thanks!