The suggested SynQuacer Linaro96board is a very impressive ITX board, but at over $1k its not exactly the deal a Rpi4b is. The meerkat from sys76 isn't a bad suggestion either at about $600 given its a finished system with a warranty. I use system76 for all my personal desk/laptops even though ubuntu isn't my flavor of choice lately. I'll definitely consider oen of those SynQuacer boards as a VPS/Docker platform.
The board ships with 32GB RAM @ 400cuckbucks. The 1k item is the full yolo tower with all bells and whistles