I use KDE Neon on my laptop and I’d prefer to have KDE as a DE on this one too (if possible) but I don’t mind a non Ubuntu base. Basically I’d just like to be able to play games on it without much hassle but I know how to paste commands into the terminal if the need arises.
I have arch kde on a similarly spec’d computer, and it runs great. Fairly easy to install with archinstall. Not sure about the 10-series GPU, but the nvidia drivers work fine on my 3070 under arch