Depends on the games but
http://www.newegg.com/Product/Product.aspx?Item=N82E16811192289
Case $19.99 + $7.99 Shipping
http://www.newegg.com/Product/Product.aspx?Item=N82E16819116782
CPU i5-3350P $189.99
http://www.newegg.com/Product/Product.aspx?Item=N82E16813130654
MoBo $54.99
http://www.newegg.com/Product/Product.aspx?Item=N82E16820104231
RAM 8GB $34.99
http://www.newegg.com/Product/Product.aspx?Item=N82E16822236155
HDD 500GB $69.99
GPU
http://www.newegg.com/Product/Product.aspx?Item=N82E16814162127
GeForce GTX 650 Ti $154.99 Free Assassin’s Creed III
http://www.newegg.com/Product/Product.aspx?Item=N82E16814150515
Radeon HD 6850 $139.99
http://www.newegg.com/Product/Product.aspx?Item=N82E16827106289
Disc drive $15.99
http://www.newegg.com/Product/Product.aspx?Item=N82E16817371044
PSU $64.99 $25.00 rebate card
http://www.newegg.com/Product/Product.aspx?Item=N82E16832416550 / http://www.newegg.com/Product/Product.aspx?Item=N82E16832116986
Windows OEM (locked to one MoBo) $99
Would be something off the top of my head should run modern games great, could probably do with some tweaking I think
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