Which PC will game/render better?

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1

I am looking to game in max settings and render video with sony vegas 12. To give one an idea I will be using the Elgato HD gaming. 

Here are the specs to the first:

  • CPU: AMD A10-5800K 3.8GHz Quad-Core Processor
  • Motherboard: ASRock FM2A75M-DGS Micro ATX  FM2 Motherboard
  • Memory: G.Skill Ares Series 8GB (2 x 4GB) DDR3-1866 Memory
  • Storage: Western Digital WP Blue WD5000AAKX 500GB 7200RPM SATA 6.0GB/S 3.5
  • Case: MSI TC- (Black) ATX Mid Tower Case 
  • Power Supply: Corsair Builder 500W 80 PLUS Certified ATX12V Power Supply
(I may crossfire with the Sapphire Radeon HD 6670 1 GB GDDR5 (128-bit) for the first build)
 
Specs to the second:
  • Athlon 2 x2 250 (2x1 MB L2 cache)
  •  Foxconn 880G mobo (710 SB)
  • SATA3 1 TB Seagate Barracuda 7200 RPM HDD
  • Sapphire Radeon HD 6670 1 GB GDDR5 (128-bit)
  • 4 GB DDR3 1333 MHz RAM
  • 500W silent flow "No Name" PSU
  • Codegen case ($50)

My budget is 300-400 dollars. I want to play games like Black Ops 2, Battlefeild 3, Minecraft, Skyrim, Farcry 3, Chrisis 3, and other high end games. Any ideas? Will both game better then console? THANK YOU!
2

will it render better yes, is it the best bang for your buck, maybe not, I'll get to work on one for you

3

THANK YOU SO MUCH THAT WOULD BE HUGE HELP!!!

4

could you tell me any parts you can reuse, like cases, power supplies, HDDs, DDR3 ram?