Is this a good build?

Solution
You definitely want a better PSU and I'd get a slightly nicer mainboard as well. Lose the fans and the thermal compound, unnecessary purchases.

PCPartPicker part list / Price breakdown by merchant

CPU: Intel - Core i5-8600K 3.6GHz 6-Core Processor ($238.99 @ Amazon)
CPU Cooler: Deepcool - GAMMAXX 400 White 74.3 CFM CPU Cooler ($37.99 @ Amazon)
Motherboard: MSI - Z370 GAMING PRO CARBON ATX LGA1151 Motherboard ($129.99 @ Newegg Business)
Memory: Crucial - Ballistix Sport LT 8GB (2 x 4GB) DDR4-2400 Memory ($85.99 @ Amazon)
Storage: Seagate - Barracuda 2TB 3.5" 7200RPM Internal Hard Drive ($54.99 @ Amazon)
Video Card: Asus - GeForce...
You definitely want a better PSU and I'd get a slightly nicer mainboard as well. Lose the fans and the thermal compound, unnecessary purchases.

PCPartPicker part list / Price breakdown by merchant

CPU: Intel - Core i5-8600K 3.6GHz 6-Core Processor ($238.99 @ Amazon)
CPU Cooler: Deepcool - GAMMAXX 400 White 74.3 CFM CPU Cooler ($37.99 @ Amazon)
Motherboard: MSI - Z370 GAMING PRO CARBON ATX LGA1151 Motherboard ($129.99 @ Newegg Business)
Memory: Crucial - Ballistix Sport LT 8GB (2 x 4GB) DDR4-2400 Memory ($85.99 @ Amazon)
Storage: Seagate - Barracuda 2TB 3.5" 7200RPM Internal Hard Drive ($54.99 @ Amazon)
Video Card: Asus - GeForce GTX 1060 6GB 6GB Dual Video Card ($310.82 @ Amazon)
Case: Fractal Design - Meshify C White TG ATX Mid Tower Case ($79.99 @ Amazon)
Power Supply: BitFenix - Formula Gold 450W 80+ Gold Certified ATX Power Supply ($55.99 @ SuperBiiz)
Case Fan: ARCTIC - Arctic F12 74.0 CFM 120mm Fan ($4.29 @ SuperBiiz)
Total: $999.04
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-07-06 04:31 EDT-0400
 
Solution
This is a more balanced build around that price point with quality components...

PCPartPicker part list / Price breakdown by merchant

CPU: Intel - Core i5-8400 2.8GHz 6-Core Processor ($178.99 @ Amazon)
Motherboard: Gigabyte - B360M DS3H Micro ATX LGA1151 Motherboard ($68.08 @ Amazon)
Memory: G.Skill - Ripjaws V Series 16GB (2 x 8GB) DDR4-2666 Memory ($149.99 @ Newegg)
Storage: Samsung - 860 Evo 250GB 2.5" Solid State Drive ($77.99 @ Amazon)
Storage: Seagate - Barracuda 2TB 3.5" 7200RPM Internal Hard Drive ($54.99 @ Amazon)
Video Card: MSI - GeForce GTX 1070 8GB Video Card ($409.99 @ Amazon)
Case: Corsair - Carbide Series 88R MicroATX Mid Tower Case ($39.99 @ Newegg)
Power Supply: Corsair - TXM Gold 550W 80+ Gold Certified Semi-Modular ATX Power Supply ($58.98 @ Newegg)
Total: $1039.00
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-07-06 04:36 EDT-0400