What computer would people suggest works best with this? As I have had nightmares with the ones I used to setup my existing configuration)
I am not familiar with the nightmares you had setting up your current config, if it was install related or hardware related or both. A friend of mine had freezing issues with a Gigabyte Brix with the J1900 processor, I even bought one (and sold it shortly thereafter) to try to work out what the issue was and never made it anywhere, just doesnt like linux I guess (in all seriousness there was an issue logged in intel's known issues list, but I cant recall what the exact issue was, rest assured they arent going to fix it

).
Otherwise, I am not sure what you are running currently, but if it runs PlasmaC it will likely run QtPlasmaC.
Anyways, I made this guide some time ago, it's like baking a cake (click by click, etc). Following the package install route should yield you a machine running MX Linux 19.4 a bit nicer of a user interface than the standard linuxcnc distro) based on Debian 10:
forum.linuxcnc.org/9-installing-linuxcnc...red-toward-new-users
Be sure to back up your config/important files before you start!
Phill made a nice migration script to get your setup from PlasmaC to QtPlasmaC:
linuxcnc.org/docs/devel/html/plasma/qtpl...tml#qt_modify-config
A lot has changed, and it may be worth re-creating your setup in pncconf.
All that said, I don't know what you use your table for, but if you are happy where you are at and it's working for you, staying put is also an option