PCPartPicker part list:
http://pcpartpicker.com/p/cwv8cf
Price breakdown by merchant: http://pcpartpicker.com/p/cwv8cf/by_merchant/
CPU: Intel Core i5-4460 3.2GHz Quad-Core Processor ($166.95 @ SuperBiiz)
Motherboard: ASRock H97M Anniversary Micro ATX LGA1150 Motherboard ($61.98 @ Newegg)
Memory: Crucial Ballistix Sport 8GB (2 x 4GB) DDR3-1600 Memory ($44.49 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($43.99 @ SuperBiiz)
Video Card: XFX Radeon R9 290 4GB Black Edition Double Dissipation Video Card ($241.98 @ Newegg)
Case: Cooler Master N200 MicroATX Mid Tower Case ($38.99 @ SuperBiiz)
Power Supply: Antec Neo Eco 620W 80+ Bronze Certified ATX Power Supply ($39.99 @ Newegg)
Total: $638.37
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-08-06 12:06 EDT-0400
it is 40$ over budget but would improve performance by a lot. Over a 280x it is 30-50% better for only 7% more money