First PC build, need feedback on parts

PCPartPicker part list / Price breakdown by merchant

CPU: Intel - Core i5-8400 2.8GHz 6-Core Processor ($178.89 @ OutletPC)
CPU Cooler: Noctua - NH-U9S 46.4 CFM CPU Cooler ($59.59 @ Newegg Marketplace)
Motherboard: ASRock - Z370 Extreme4 ATX LGA1151 Motherboard ($112.00 @ Newegg)
Memory: G.Skill - Ripjaws V Series 16GB (2 x 8GB) DDR4-2666 Memory ($158.99 @ Newegg)
Storage: Samsung - 970 Evo 250GB M.2-2280 Solid State Drive ($106.99 @ Amazon)
Case: Fractal Design - Define C ATX Mid Tower Case ($79.99 @ SuperBiiz)
Power Supply: EVGA - SuperNOVA G3 550W 80+ Gold Certified Fully-Modular ATX Power Supply ($47.99 @ Newegg)
Total: $744.44
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-07-15 11:24 EDT-0400

1. Z370 motherboard thats cheaper. Allows more future upgrade capability. Motherboard is typically over $140.
2. Lower CAS RAM for less money.
3. Better quality PSU.
 
Solution
Jul 15, 2018
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I will do that and see if it holds up. Thank you
 
Jul 15, 2018
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Thanks for the suggestions The prices and discounts doesnt apply to me. I live outside of the UK. The Corsair isnt discounted anymore, so Im thinking abou upgrading to a Seasonic Focus+ 650W. Thoughts?