PCPartPicker part list:
http://pcpartpicker.com/p/PvtB7P
Price breakdown by merchant: http://pcpartpicker.com/p/PvtB7P/by_merchant/
CPU: Intel Core i5-4440 3.1GHz Quad-Core Processor ($168.99 @ NCIX US)
Motherboard: ASRock H81M-DGS R2.0 Micro ATX LGA1150 Motherboard ($43.98 @ Newegg)
Memory: Mushkin Blackline 8GB (2 x 4GB) DDR3-2400 Memory ($63.98 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($49.99 @ SuperBiiz)
Video Card: Zotac GeForce GTX 660 2GB Video Card ($129.99 @ Newegg)
Case: NZXT Source 210 (Black) ATX Mid Tower Case ($34.99 @ SuperBiiz)
Power Supply: SeaSonic 620W 80+ Bronze Certified Fully-Modular ATX Power Supply ($54.99 @ Amazon)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer ($13.99 @ Newegg)
Operating System: Microsoft Windows 8.1 - 64-bit (OEM) (64-bit) ($92.00 @ B&H)
Total: $652.90
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-12-29 20:36 EST-0500
This is about the best build possible for around $650.