Graphics card $280

There are some great deals on the GTX 660 Ti. I'd go for the MSI GTX 660 Ti PowerEdition OC for $280 with a free copy of Metro Last Light. It comes with an all-custom design and a high factory overclock. That will bump you up from mid-level to the high-end performance bracket.
http://www.newegg.com/Product/Product.aspx?Item=N82E16814127696
http://www.techpowerup.com/reviews/MSI/GTX_660_Ti_Power_Edition/1.html

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http://www.techpowerup.com/reviews/Inno3D/iChill_GTX_650_Ti_Boost/26.html