Which ones do you have? Which ones would you get if you were buying now?

This sounds great! I’d love to see your config. I’m not using home manager, but have 1 non root user for all podman containers. 1 user per service seems like a great setup.

What is the Wi-Fi card for? What software are you using?

To clarify for others, that’s just for motor and AC loads. Rated capacity for resistive loads is 1800 W (15 A). Aside from a portable induction stovetop and possibly portable AC units, this is likely fine for most things people will connect to it. Its probably not a good fit for OP though.

The pine64 Pinecil is a great starter soldering iron.

You’ve already received some great suggestions. Another one is Netdata. Personally, I use glances to collect the data and Home Assistant to display the dashboard. But I only do this because I already had Home Assistant running.