With 750, you cannot get a 1070 with the current prices.
This is the best you can do:
PCPartPicker part list:
https://pcpartpicker.com/list/Vz6V7W
Price breakdown by merchant: https://pcpartpicker.com/list/Vz6V7W/by_merchant/
CPU: AMD - Ryzen 5 1600 3.2GHz 6-Core Processor ($174.88 @ OutletPC)
Motherboard: MSI - B350M GAMING PRO Micro ATX AM4 Motherboard ($49.99 @ Newegg)
Memory: Patriot - Viper 4 8GB (2 x 4GB) DDR4-3000 Memory ($84.99 @ Newegg)
Storage: Western Digital - Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($43.85 @ OutletPC)
Video Card: Zotac - GeForce GTX 1060 6GB 6GB Mini Video Card ($319.89 @ OutletPC)
Case: Cooler Master - MasterBox Q300L MicroATX Mini Tower Case ($38.99 @ SuperBiiz)
Power Supply: Corsair - TXM Gold 550W 80+ Gold Certified Semi-Modular ATX Power Supply ($49.99 @ Newegg)
Total: $762.58
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-04-17 06:17 EDT-0400