AMD Radeon HD 7850 2GB (manufactured by MSI) for $119 after $30 mail-in-rebate (otherwise $149, still not bad) from NewEgg during "Black November".
Put the graphical power of the PlayStation4 in your budget gaming PC!
Make your own SteamBox that matches or beats the PS4 plus can do a whole lot more. Just add this video card and at least 8GB of memory to have your own do-it-yourself "next gen" console.
Unfortunately does not include a free game offer like some of the lower-end Radeons do at NewEgg.