Think Ryzen 3600 is a great CPU and you can still upgrade it with 2020 cpus! (If need be)
Rtx 2070 and 2070 super are good cards!
I can run in VR without many problems with my 2700x! Yes you always want more but i think it’s a good sweet spot!
Motherboards are tricky to choose! I don’t think they are game changer in speed! Could help in better overclock! Checkkwich features you need!
And above all USB ports, number types and quality! We have many peripherals and good usb can be a plus! Also i’ll expect seeing more and more usb-c in future!
Some vr enjoy a good and stable usb too!