650 USD Gaming computer

Without monitor, OS and peripherals:

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i3-4130 3.4GHz Dual-Core Processor ($104.95 @ SuperBiiz)
Motherboard: MSI H81M-P33 Micro ATX LGA1150 Motherboard ($44.88 @ OutletPC)
Memory: Crucial Ballistix Sport 8GB (2 x 4GB) DDR3-1600 Memory ($71.98 @ Newegg)
Storage: Crucial MX100 128GB 2.5" Solid State Drive ($62.99 @ Amazon)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($52.24 @ Directron)
Video Card: MSI Radeon R9 280 3GB TWIN FROZR Video Card ($203.98 @ Newegg)
Case: Zalman Z9 ATX Mid Tower Case ($37.99 @ Micro Center)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply ($58.99 @ SuperBiiz)
Optical Drive: Lite-On iHAS124-14 DVD/CD Writer ($13.99 @ Newegg)
Total: $651.99
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-02-13 08:30 EST-0500

If you don't like or don't need the SSD for faster system startup and faster loading in general, you can leave this one out and get an even stronger grapics card, maybe like R9 280X or even R9 290.
 
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