I have a DMT Diasharp course, fine, and extra fine. I don't use the extra fine much because mine doesn't feel very smooth at all, though it does work. I also have a Norton India combination course/fine bench stone that I tend to use the most now. Still getting used to it. I forget what it cost, but it's around $30 I think, and it's a stone that will do all you need and last a lifetime, with no or at least very little need for flattening. And it feels right sharpening a traditional knife on it. Traditional stone for a traditional knife I guess. I'm looking to get some sort of Norton India pocket stone, but for now I have a DMT Minisharp fine diamond keyring sharpener that works very well. Also looking to try a Fallkniven DC3 or DC4, just not sure if their ceramics are raise aa larger burr on carbon steel or if they are good for polishing off the burr from the diamond. Might try one out. Anyways, that's what I use. Sometimes a cheapo combo stone that works fine.
And the bottom , unglazed ceramic portion of a coffeecup sometimes for touch-ups. Read through some of the posts from our respected elder on the trad forum jackknife, you'll find much wisdom in what he says. And he keeps it nice and basic as it should be.