I'll second the recommendation for real PC hardware. Tinkering is fun up until it's not. When it becomes not fun is when something breaks, takes down a system you have come to rely on, and now it becomes work to recreate the functionality you used to take for granted. Seeing people go for the RPi for something they're going to put a lot of hours into makes me cringe a bit, having had several SD card filesystems get corrupt. If that's what it takes to get you started with self hosting, by all means go for it. But there is much nicer hardware for running servers on.
Having said that, I still use RPis for edge devices and the like.
PS I really like that idle power figure on your server. I wish there were a list of power consumption figures for integrated hardware, it seems quite hit or miss.