I stumbled onto MM2.5 10 days ago with little background in JS. I’ve had a blast getting my mirror set-up and am in awe of its capabilities and the developers contributing time and energy to this FREE project. Complaining about anything just seems misplaced to me. Instead, dig in a little and “learn the ropes”. Don’t know if I’ll dig in myself, but it sure looks like fun!
Everything you spec’d will work fine. As for the monitor, just about anything will work. There really isn’t a “best” monitor.
What do you want to display and where do you want to display it? Quite often builders will get a monitor that is 1/4 the size of the mirror and mount the monitor so they are displayed in the upper left or right of the actual mirror. Is this to be installed as a bathroom mirror? Do you want to stare at the weather report in front of your face while you are trying to shave?
As for the best “quality” monitor, anything you buy will work great. Figure out the size you want then look at how the thing is rated by customers and professionals. People here are from all over the world. Many in the U.S. use Craigs List to find monitors.
Don’t install pm2 until you are comfortable that all of your modules are working correctly. There is good info that can be had from starting the mirror from a terminal session.