So, assuming purely gaming at 1080p:
-x4 955 $120 (http://www.newegg.com/Product/Product.aspx?Item=N82E16819103808)
with a cheap cooler:
-Hyper TX3 $25 (http://www.newegg.com/Product/Product.aspx?Item=N82E16835103064&Tpk=hyper%20tx3)
-Samsung Spinpoint F3 1tb $60 (http://www.newegg.com/Product/Product.aspx?Item=N82E16822152185&Tpk=spinpoint%20f3%201tb)
-MSI Hawk 560 Ti $265 (http://www.newegg.com/Product/Product.aspx?Item=N82E16814127578)
-8gb G.Skill 1600 RAM $50 (http://www.newegg.com/Product/Product.aspx?Item=N82E16820231428)
-Corsair 500W $60 (http://www.newegg.com/Product/Product.aspx?Item=N82E16817139027)
-ODD $20 whatever
-NZXT Gamma $35 (http://www.newegg.com/Product/Product.aspx?Item=N82E16811146061&Tpk=nzxt%20gamma)
That's $635. Do you need Windows?