http://pcpartpicker.com/user/Danbuscus250/saved/4qil
CPU AMD A10-5800K 3.8GHz Quad-Core Combo or $109.99
Motherboard MSI A55M-E33 Micro ATX FM2+ $39.99
Memory G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1866 Combo or $79.99
Storage Western Digital Caviar Blue 1TB 3.5" 7200RPM $56.98
Video Card XFX Radeon HD 6670 1GB $69.99
Case Thermaltake VL80001W2Z ATX Mid Tower $24.99
Power Supply Cooler Master 450W ATX12V $29.99
Optical Drive LG GH24NSB0 DVD/CD Writer $15.98
Operating System Microsoft Windows 8.1 (OEM) (64-bit) $89.98
Total: $502.88
this is assuming you need an OS, but not a monitor or keyboard/mouse. if you arent sure how to build it, watch a video on youtube on how, i would recommend this video
https://www.youtube.com/watch?v=OlCqYyAQE_w