Faster RAM equals better APU gaming performance.
I am sure you can afford 3$ more.
PCPartPicker part list:
http://pcpartpicker.com/p/1ufkb
Price breakdown by merchant: http://pcpartpicker.com/p/1ufkb/by_merchant/
Benchmarks: http://pcpartpicker.com/p/1ufkb/benchmarks/
CPU: AMD A8-5600K 3.6GHz Quad-Core Processor ($92.23 @ Amazon)
Motherboard: MSI FM2-A75MA-E35 Micro ATX FM2 Motherboard ($56.00 @ Amazon)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-2400 Memory ($63.00 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($59.98 @ Outlet PC)
Case: Xion XON-560 MicroATX Mini Tower Case ($29.99 @ Newegg)
Power Supply: Corsair Builder 430W 80 PLUS Certified ATX12V Power Supply ($25.99 @ NCIX US)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($18.49 @ Amazon)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) ($89.98 @ Outlet PC)
Total: $435.66
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-08-20 15:45 EDT-0400)