Keep your current storage options, and if you don't have an SSD take the one included from the build. If you have, remove the SSD from this build. Use the same case.
Which PSU?
PCPartPicker part list:
https://ca.pcpartpicker.com/list/RjJn7W
Price breakdown by merchant: https://ca.pcpartpicker.com/list/RjJn7W/by_merchant/
CPU: Intel - Core i5-8400 2.8GHz 6-Core Processor ($229.95 @ Vuugo)
Motherboard: ASRock - Z370 Pro4 ATX LGA1151 Motherboard ($119.50 @ Vuugo)
Memory: Patriot - Viper 4 8GB (2 x 4GB) DDR4-3000 Memory ($119.99 @ Newegg Canada)
Storage: Transcend - 240GB 2.5" Solid State Drive ($81.99 @ PC-Canada)
Video Card: Gigabyte - GeForce GTX 1060 6GB 6GB Mini ITX OC Video Card ($409.99 @ Memory Express)
Total: $961.42...