Oh, you'll never be finished buying stones...
I sharpen at a farmers market and depending on the knife (or edge damage) use a 320 shapton glass, 700 ceramic and a 1000 shapton ceramic. If they have a high end blade I may use a 1500 ceramic but usually the 1000 is good enough, and then strop...
Get some EDM polishing stones and switch to those after the 120/220. You can apply pressure differently and create your own shapes to get into tricky spots. Falcon has some good sets and Gesswein sells them as well. Once you get a hazy finish with them, you can see where your bigger scratches...