PCPartPicker part list:
http://pcpartpicker.com/p/3g0Rm
Price breakdown by merchant: http://pcpartpicker.com/p/3g0Rm/by_merchant/
Benchmarks: http://pcpartpicker.com/p/3g0Rm/benchmarks/
CPU: AMD A8-6600K 3.9GHz Quad-Core Processor ($102.99 @ SuperBiiz)
Motherboard: Biostar Hi-Fi A85W ATX FM2 Motherboard ($67.55 @ Newegg)
Memory: G.Skill Ares Series 8GB (2 x 4GB) DDR3-1600 Memory ($64.99 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($59.99 @ Newegg)
Case: NZXT Source 210 (Black) ATX Mid Tower Case ($37.99 @ Micro Center)
Power Supply: Corsair CX 500W 80+ Bronze Certified Semi-Modular ATX Power Supply ($69.99 @ Amazon)
Monitor: AOC e2050Swd 60Hz 19.5" Monitor ($89.99 @ Amazon)
Total: $493.49