I picked up a HD 7570 low profile, 1 gb DDR5 on ebay for $35 shipped and it came with a display port to hdmi adapter. Its an OEM rebrand of the HD 6570. Cheap, runs great on the OSS driver. I couldn't be happier. My other suggestion would be GT 640 with 2 Gb DDR3 or if you can find it 1 Gb DDR5. I have one in my hackintosh and dual booted it with Ubuntu and the blob driver. New its going for $90. I got a referb over a year ago for $65. I'm all about cheap as i don't game often enough to justify spending much on a GPU. Hope thats helpful.