For $670 I came up with this. (dat price tho)
PCPartPicker part list:
http://pcpartpicker.com/p/trRt99
Price breakdown by merchant: http://pcpartpicker.com/p/trRt99/by_merchant/
CPU: AMD FX-6300 3.5GHz 6-Core Processor ($108.99 @ SuperBiiz)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.98 @ OutletPC)
Motherboard: Gigabyte GA-970A-UD3P ATX AM3+ Motherboard ($69.99 @ Newegg)
Memory: Kingston Fury Red Series 8GB (2 x 4GB) DDR3-1866 Memory ($74.99 @ Amazon)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($54.98 @ OutletPC)
Video Card: Sapphire Radeon R9 270 2GB Dual-X Video Card ($139.99 @ Newegg)
Case: Corsair 200R ATX Mid Tower Case ($49.99 @ Newegg)
Power Supply: Corsair Builder 500W 80+ Bronze Certified ATX Power Supply ($29.99 @ Newegg)
Monitor: BenQ GW2255 60Hz 21.5" Monitor ($107.60 @ Amazon)
Total: $666.50
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-07-25 17:22 EDT-0400
The BenQ monitor is decent and is 1080p with a 60hz refresh rate. I also added a Hyper 212 EVO to overclock your fx 6300.