Got a new PC a couple of months ago as various problems with the ond one. Didn't assemble it myself, but did pick the parts. Except I'd have gone for 3200MHz memory if I'd been picking up the parts myself, the suppliuer only had that in insanely expensive. Very similar to your picks.
Asus TUF B450M-PLUS GAMING Motherboard
AMD Wraith Spire Stock CPU Cooler
AMD Ryzen 5 3600 CPU, 6 Cores, 4.2GHz
16GB DDR4 3000MHz Memory (2 x 8GB Sticks)
NVIDIA GeForce GTX 1660 Super 6GB Graphics Card
500GB Samsung 970 EVO PLUS M.2 PCIe Solid State Drive
Seagate 6TB BarraCuda 5900RPM Hard Disk
24x DVD-RW Drive
Corsair RM650x 80 PLUS Gold 650W PSU
Asus TUF B450M-PLUS GAMING Motherboard
AMD Wraith Spire Stock CPU Cooler
AMD Ryzen 5 3600 CPU, 6 Cores, 4.2GHz
16GB DDR4 3000MHz Memory (2 x 8GB Sticks)
NVIDIA GeForce GTX 1660 Super 6GB Graphics Card
500GB Samsung 970 EVO PLUS M.2 PCIe Solid State Drive
Seagate 6TB BarraCuda 5900RPM Hard Disk
24x DVD-RW Drive
Corsair RM650x 80 PLUS Gold 650W PSU