PCPartPicker part list:
http://pcpartpicker.com/p/3uRNQ
Price breakdown by merchant: http://pcpartpicker.com/p/3uRNQ/by_merchant/
Benchmarks: http://pcpartpicker.com/p/3uRNQ/benchmarks/
CPU: AMD Athlon X4 750K 3.4GHz Quad-Core Processor ($79.19 @ TigerDirect)
Motherboard: Gigabyte GA-F2A75M-HD2 Micro ATX FM2+ Motherboard ($64.99 @ Newegg)
Memory: GeIL EVO POTENZA 8GB (2 x 4GB) DDR3-1600 Memory ($63.99 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($56.99 @ NCIX US)
Video Card: PowerColor Radeon HD 7770 GHz Edition 1GB Video Card ($102.98 @ SuperBiiz)
Case: NZXT Source 210 (Black) ATX Mid Tower Case ($37.99 @ Micro Center)
Power Supply: Corsair Builder 430W 80+ Bronze Certified ATX Power Supply ($39.99 @ Micro Center)
Total: $446.12