I don’t personally own one, so that’s really good to know! I mostly thought of it since it checked most of what OP was looking for, without being a full on Voron. That’s said, I’m not sure how much of a beginner machine the Core One will be either. Regardless, I’ll add a proceed with caution on my recommendation.
Out of curiosity, what upgrades did you have to make to sv08?
(I also graduated from the Thessian Ender 3 program and went to a v2.4)
I highly recommend Orca Slicer, it’s forked from bamboo slicer (which is in turn forked from Prusa), so has their modern UI/ layout and natively, as well as natively support bamboo printers. If Bamboo’s not your jam, it also plays very nicely with Klipper. As an added bonus, it regularly gets new features added or ported from the other slicers.