jbakerlent

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Your build uses several past generation parts. I would recommend something like this instead:

AMD Phenom II X3 720 2.8GHz 3 x 512KB L2 Cache 6MB L3 Cache Socket AM3 95W Triple-Core Black
http://www.newegg.com/Product/Product.aspx?Item=N82E16819103649

GIGABYTE GA-MA770T-UD3P AM3 AMD 770 ATX AMD
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128392

OCZ Platinum 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 1066 (PC2 8500) Dual Channel Kit Desktop
http://www.newegg.com/Product/Product.aspx?Item=N82E16820227298

XFX HD-485X-YDFC Radeon HD 4850 512MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready CrossFire Supported
http://www.newegg.com/Product/Product.aspx?Item=N82E16814150337

SAMSUNG Spinpoint F3 HD502HJ 500GB 7200 RPM 16MB Cache SATA 3.0Gb/s 3.5" Internal
http://www.newegg.com/Product/Product.aspx?Item=N82E16822152181&Tpk=f3%20500gb

OCZ ModXStream Pro OCZ500MXSP 500W ATX12V V2.2 / EPS12V SLI Certified CrossFire Ready 80 PLUS Certified Modular Active PFC
http://www.newegg.com/Product/Product.aspx?Item=N82E16817341016

Antec Two Hundred Black ATX Mid Tower
http://www.newegg.com/Product/Product.aspx?Item=N82E16811129070

SAMSUNG Black 22X DVD+R 8X DVD+RW 22X DVD-R 16X DVD-ROM 48X CD-ROM 2MB Cache SATA
http://www.newegg.com/Product/Product.aspx?Item=N82E16827151188

You'll appreciate the the better GPU in particular. This totals about $550 but if that's over your budget, changes can be made.
 

jbakerlent

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Nope, looks like you got the cheapest one. Also, hunter is correct about the RAM, you could go with the board he suggested and keep the RAM or go with the RAM I suggested and not use the old RAM.
 
The 785G would NOT be able to handle it, the AMD IGPs are decent at 1024x768 but 1280x1024 is alot more stressful and it wouldnt be able to maintain playable frame rates at medium or high detail level no matter how not demanding the game is. It cant even give 30 FPS in L4D at medium settings at that resolution.