Thank you all for the comprehensive answers.
My thoughts for the Quest is to see if I could use it in the same way that some have used the Oculus Go with ALVR, but hopefully with 6DOF. I can justify purchase of the Quest then to use for it's primary use and for it's portability when I travel for work.
Current computer is a Dell "gaming" laptop - i7-7700, GTX1050Ti, and 16GB ram. (saving for a dedicated flight sim system) I know it's on the very low end/possibly not good enough. I have gotten "phone" VR to display but without head tracking and I'm not sure I have the display optimised - i.e. ipd, and display size etc.
@DeltaMike, thanks for bringing up the lenovo option. I had been considering buying a Playstation VR HMD secondhand (about $180 AUD) and camera setup, but could only find details about it's use with Steam VR programs.
@Mesenzio, thanks. I have a lot more to learn and ask about to set something up software wise.
@DerekSpeare, thanks for the link - it's already been a bit of a rabbit hole! I've also saved and started reading setting and tips link too. I'm certainly keeping an eye out now on the secondhand market for system equipment. Just have to be strategic about it lest I incur too much wrath from the Minister for War and Finances.
@Svsmokey, I can't think of the Rift-S as a budget HMD, I was thinkingof the Quest (if it would work) as dual function -wireless VR and tethered flightsim VR.
Cheers again all,