Newegg.com - XFX HD-667X-ZHF3 Radeon HD 6670 1GB 128-bit DDR3 PCI Express 2.1 x16 HDCP Ready Video Card
Radeon HD 6770
AMD is the best for graphics cards, better than nVidia in my opinion. The above is $84 on newegg, and it's XFX, which is one of the best makers of graphics cards because, they offer lifetime warranty on their products. Which means if this breaks after a good run, say 4-5 years, XFX will either replace it, or if it's obsolete, upgrade to a better, current video card. XFX trumps Sapphire and all other VideoCard brands.