Awesome tips, thanks.
One note about the Bose QC35. They're very bad at picking up background noises in even moderately noisey offices. We had a lot trouble with them. I had to use the QC25 cable mic to minimise noise. Would recommend getting the cable mic or the new Bose 700.
There has been a lot written about the various applications that allow you to connect online. However, not much about improving the audio and visual quality. The only thing I wonder about is a portable green screen to mask the background? Do you have any thoughts on that?