Hi
I used to have a Dell 3050 micro i3 7100T with SSD and 20gb of ram as a server.
12w at idle.
it's fast (at least for my needs), cheap if used, gigabit ethernet, 6 usb 3.0, ultra small, cool
now a changed for a ryzen 3600 (I regreted with 60w+ at idle and not noticing signifcant performance except for videogames).
the only downside is it's crappy UHD 630 graphics, maybe a problem with plex