New Build Opinions/Suggestions

Hello there Tom's Hardware, I'm putting together an AMD build for a friend that's preferably at a $600 budget. I scoured the internet for hours, and this is what I put together. It's slightly over budget; I'm just looking to see if you all have any suggestions on alternate parts that are either cheaper, or better (and opinions of course).

CPU - AMD Phenom II X4 965 Black Edition 3.4 GHz AM3 Socket Quad-Core - $85
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
OR (I would fork out the extra $20 for the hexacore...)
CPU - AMD FX-6100 Zambezi 3.3GHz AM3+ Socket Six-Core - $105
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
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GPU - Radeon HD 7850 1GB 256-bit GDDR5 PCI Express 3.0 x16 - $170
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
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MOBO - ASRock 970 EXTREME4 AM3+ ATX Form Factor - $100
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
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RAM - G.SKILL Ripjaws X Series 8GB (2 x 4GB) DDR3 SDRAM 1600 - $40
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
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PSU - CORSAIR TX Series 650W 80 PLUS BRONZE Certified - $90
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
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HDD - Seagate Barracuda 1TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" - $70
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
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Case - COOLER MASTER Storm Scout Black Steel / Plastic ATX Mid Tower - $70
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

OR (This comes down to preference, unless one has significantly better airflow)

Case - Antec Three Hundred Illusion Black Steel ATX Mid Tower - $70
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

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Total - $625 - 645