Velocipastor is so much better than it has any right to be.
Helen Keller vs. Night Wolves has the most hilarious opening song and is the very definition of a B movie.
Super Hybrid is another B movie that has no right to be as good as it is. Highly recommend.
As mentioned in some other comments Poultrygeist: Night of the Chicken Dead is an absolutely ridiculous romp from Troma.
KDE just works on my machine, which is lower specs than yours. I’ve never had it crash. I use Endeavor OS, so it came with it by default (which was part of the reason I chose it).
Edit: I don’t do much tweaking of the KDE settings other than the main color scheme. I also have never had an issue with waking from sleep on Endeavor (but I recall in years past that was an issue with most distros I tried and unrelated to KDE since I was less a fan of its style back then and didn’t use KDE). My set up is a normal desktop PC that I use daily for everything, including gaming.