Instead of getting a used 970 for around 200 bucks, a new 380X for the same money is a very good idea.. see its compare with the 970 - even better than the 970 at ultra settings..
http://us.hardware.info/comparisontable/products/251880-329461
Also a motherboard with 4-RAM slots will allow you to add 2 RAM sticks later-on instead of having to replace them when u want to upgrade RAM..
PCPartPicker part list:
http://pcpartpicker.com/p/hgs4t6
Price breakdown by merchant: http://pcpartpicker.com/p/hgs4t6/by_merchant/
CPU: Intel Core i5-6500 3.2GHz Quad-Core Processor ($194.89 @ OutletPC)
Motherboard: Gigabyte GA-B150M-D3H Micro ATX LGA1151 Motherboard ($76.98 @ Newegg)
Memory: G.Skill Ripjaws V Series 8GB (2 x 4GB) DDR4-2133 Memory ($33.89 @ OutletPC)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($45.89 @ OutletPC)
Video Card: Gigabyte Radeon R9 380X 4GB WINDFORCE 2X Video Card ($200.99 @ Newegg)
Case: Corsair Carbide SPEC-M2 MicroATX Mid Tower Case ($34.99 @ Newegg)
Power Supply: SeaSonic S12II 620W 80+ Bronze Certified ATX Power Supply ($61.99 @ SuperBiiz)
Total: $649.62
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-05-17 03:18 EDT-0400