If you can sring some additional cash you can remove the SSD and upgrade the 380X to a 970, but otherwise was the best I could do with 600 and get an SSD (i consider this a requirement for any build but some people will disagree as it can be upgraded later)
PCPartPicker part list:
http://pcpartpicker.com/p/KFrw99
Price breakdown by merchant: http://pcpartpicker.com/p/KFrw99/by_merchant/
CPU: AMD FX-6300 3.5GHz 6-Core Processor ($98.89 @ OutletPC)
Motherboard: MSI 970A-G43 ATX AM3+ Motherboard ($64.89 @ OutletPC)
Memory: Crucial Ballistix Sport XT 8GB (2 x 4GB) DDR3-1600 Memory ($34.99 @ Amazon)
Storage: Kingston SSDNow V300 Series 120GB 2.5" Solid State Drive ($39.99 @ Amazon)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($46.89 @ OutletPC)
Video Card: XFX Radeon R9 380X 4GB DD XXX OC Video Card ($219.99 @ Newegg)
Case: Thermaltake Versa H21 ATX Mid Tower Case ($34.99 @ SuperBiiz)
Power Supply: EVGA 600B 600W 80+ Bronze Certified ATX Power Supply ($50.99 @ SuperBiiz)
Total: $591.62
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-02-15 01:03 EST-0500