CPU: AMD FX-6300 3.5GHz 6-Core Processor ($118.49 @ Amazon)
Motherboard: Gigabyte GA-78LMT-USB3 Micro ATX AM3+ Motherboard ($59.99 @ Micro Center)
Memory: PNY Optima 8GB (2 x 4GB) DDR3-1333 Memory ($59.50 @ Amazon)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($54.99 @ Amazon)
Video Card: Sapphire Radeon R9 270X 2GB Tri-X Toxic Video Card ($237.99 @ Amazon)
Case: Raidmax ATX-298WBP ATX Mid Tower Case w/500W Power Supply ($54.99 @ Newegg)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) ($89.99 @ TigerDirect)
Total: $675.94
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-04-23 00:24 EDT-0400)
Ram and PSU both can be changed.