Well my PC died about 6 weeks ago. So yesterday evening I got all the parts together for a budget box (based on the Ars Technica budget one). Put it altogether last night, installed Win 7 on it. The video card is the relatively cheap radeon 6850. I've seen a few issues with nvidia listed here... But I was using one until recently. I'll get shogun 2 on it and see how it runs. All the graphics cards you listed are more powerful then that so I'll be showing the minimal experience