why not to build your own, wouldn't that be more fun?

you can start with something cheap like an old laptop and if you like it and need it move to somefhing more robust.

I first tested star9 OS with a raspberryPI 4 with an external SSD of 2TB, worked flawlessly, 3 years running a Node without a glitch.

Played with more robust hardware to add NexCloud, relays, etc, quite stable and excellent OS