Here's what I recommend you :
PCPartPicker part list:
http://pcpartpicker.com/p/1DsFz
Price breakdown by merchant: http://pcpartpicker.com/p/1DsFz/by_merchant/
Benchmarks: http://pcpartpicker.com/p/1DsFz/benchmarks/
CPU: AMD A8-5600K 3.6GHz Quad-Core Processor ($92.23 @ Amazon)
Motherboard: MSI FM2-A75MA-P33 Micro ATX FM2 Motherboard ($49.99 @ Microcenter)
Memory: Crucial Ballistix 4GB (2 x 2GB) DDR3-1866 Memory ($33.81 @ NCIX US)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($59.99 @ NCIX US)
Case: Fractal Design Core 1000 USB 3.0 MicroATX Mid Tower Case ($26.99 @ Microcenter)
Power Supply: Corsair CX 430W 80 PLUS Bronze Certified ATX12V Power Supply ($29.99 @ Newegg)
Total: $293.00
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-09-13 21:48 EDT-0400)