Looking into buying a new gpu for under $350 and I saw this. Not many reviews so I couldn't really tell if it was good or not.
http://www.amazon.com/Sapphire-Version-PCI-Express-Graphics-11221-00-20G/dp/B00FLMKNE0/ref=sr_1_2?ie=UTF8&qid=1383690070&sr=8-2&keywords=r9+280x
http://www.amazon.com/Sapphire-Version-PCI-Express-Graphics-11221-00-20G/dp/B00FLMKNE0/ref=sr_1_2?ie=UTF8&qid=1383690070&sr=8-2&keywords=r9+280x