Here is a low budget list with the link to the parts down below:
CPU: AMD FX-4130 3.8GHz Quad-Core Processor ($94.99 @ TigerDirect)
Motherboard: MSI 970A-G46 ATX AM3+ Motherboard ($79.99 @ Newegg)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory ($76.99 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($59.99 @ Newegg)
Video Card: Asus Radeon HD 7770 GHz Edition 1GB Video Card ($95.38 @ Newegg)
Case: Corsair Graphite Series 230T Black ATX Mid Tower Case ($69.99 @ Newegg)
Power Supply: Cooler Master 400W ATX Power Supply ($39.98 @ Newegg)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer ($19.99 @ Newegg)
Total: $537.30
(Prices include shipping, taxes, and discounts when available.)
http://pcpartpicker.com/p/2MIWa