Your component list could use a few changes such as changing the PSU, RAM and the addition of an SSD.
Below is what I would recommend, changed parts are underlined and in bold text:
CPU: Ryzen 5 3600 (250 AUD)
Motherboard: Gigabyte Aorus M (150 AUD)
RAM: G.Skill Aegis 16GB 3000MHz (141.90 AUD) (reason for change: g.skill aegis is cheaper and higher frequency)
GPU: EVGA GTX 1660 Ti XC Gaming (448.80 AUD) (reason for change: cheaper card but is still just as good as the gigabyte card, if not better)
Storage: Crucial MX500 250GB + Seagate Barracuda 2TB (MX500 is 75 AUD, Seagate 2TB is 80 AUD) (reason for change: having an SSD and a HDD rather than an SSHD is better value)
PSU: Corsair CX450M (79 AUD) (reason for change: Corsair VS-series PSUs are crap, CX-series PSUs are much better)
Case: Riotoro CR500 (75 AUD)
Fans: Noctua Industrial x4 (35 AUD each)