PCPartPicker part list:
https://pcpartpicker.com/list/vsqcQV
Price breakdown by merchant: https://pcpartpicker.com/list/vsqcQV/by_merchant/
CPU: Intel - Core i5-8400 2.8GHz 6-Core Processor ($200.98 @ Newegg)
Motherboard: ASRock - Z370 Killer SLI/ac ATX LGA1151 Motherboard ($109.99 @ Newegg)
Memory: Crucial - 8GB (2 x 4GB) DDR4-2400 Memory ($87.99 @ SuperBiiz)
Storage: Kingston - A400 120GB 2.5" Solid State Drive ($49.99 @ Amazon)
Storage: Western Digital - Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($46.68 @ OutletPC)
Video Card: MSI - GeForce GTX 1070 8GB Video Card ($469.99 @ Newegg)
Case: Cooler Master - MasterBox Lite 5 ATX Mid Tower Case ($36.99 @ Newegg)
Power Supply: Corsair - TXM Gold 550W 80+ Gold Certified Semi-Modular ATX Power Supply ($54.99 @ Newegg)
Total: $1057.60
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-01-05 21:39 EST-0500
This should be plenty.
It does not include an OS, but if you do not mind the watermark it is okay to leave it unactivated.
Has an i5 8400 and a 1070.