That is a much, much better build and brings you right up to date. The X570 Motherboard will make sure you have no compatibility issues with the Ryzen 3600 and will be great for any future CPU upgrade. The only thing I would add is a proper NVMe M.2 SSD like the Western Digital Blue SN500 (added to part list below) for the X570 motherboard as it is a quantum leap in speed over what you have chosen with Sequential read speeds up to 1, 700MB/s and sequential write speeds up to 1, 450MB/s. You can get much faster but than you have to balance costs as well and you get a great guarantee with WD. Still do shop around for a decent NVMe drive to see if you can get something cheaper.
PCPartPicker Part List:
https://au.pcpartpicker.com/list/CgXbtp
CPU: AMD Ryzen 5 3600 3.6 GHz 6-Core Processor ($314.00 @ Shopping Express)
Motherboard: MSI X570-A PRO ATX AM4 Motherboard ($258.00 @ Shopping Express)
Memory: Crucial Ballistix Sport LT 16 GB (2 x 8 GB) DDR4-3200 Memory ($132.00 @ Skycomp Technology)
Storage: Western Digital Blue SN500 500 GB M.2-2280 NVME Solid State Drive ($105.31 @ Amazon Australia)
Power Supply: Corsair RMx 550 W 80+ Gold Certified Fully Modular ATX Power Supply ($149.00 @ Centre Com)
Total: $958.31
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2019-09-17 22:10 AEST+1000