Help with my budget gaming build.

Backwardsman97

Distinguished
Oct 17, 2010
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18,510
I want to build a gaming pc and my budget is exactly $650. I'm just gonna be using this computer for like Source engine games and maybe some newer ones. Nothing super up-to-date. Here's what I have. I'm completely open to suggestions.

WD Caviar Black 500GB - $57.73
OCZ Fatal1ty 550W ATX12V - $64.99
G.SKILL Ripjaws Series 4GB DDR3 1333 - $79.99
EVGA GeForce 9800 GT Video Card 512MB GDDR3 - $91.99
AMD Athlon II X3 445 - $74.99
ASRock 770 EXTREME3 AM3 - $74.99

Now I still need a case and an OS. I wanted to get something like windows 7 home premium.
 
I want to build a gaming pc and my budget is exactly $650

Tower @ $511AR
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OS $100
http://www.newegg.com/Product/Product.aspx?Item=N82E16832116754

$611AR in total (before option of after market HSF)