PCPartPicker part list:
http://pcpartpicker.com/p/rZ7BhM
Price breakdown by merchant: http://pcpartpicker.com/p/rZ7BhM/by_merchant/
CPU: Intel Core i5-4670 3.4GHz Quad-Core Processor ($209.98 @ SuperBiiz)
Motherboard: Asus H97-PLUS ATX LGA1150 Motherboard ($105.24 @ Amazon)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-2400 Memory ($82.98 @ OutletPC)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($54.98 @ OutletPC)
Video Card: MSI Radeon R9 270X 2GB TWIN FROZR Video Card ($179.99 @ Amazon)
Case: NZXT Source 210 (Black) ATX Mid Tower Case ($37.99 @ Micro Center)
Power Supply: XFX ProSeries 450W 80+ Bronze Certified ATX Power Supply ($61.98 @ SuperBiiz)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer ($14.98 @ OutletPC)
Total: $748.12
Prices include shipping, taxes, and discounts when available