As big as you can get is how I feel. Since a good part of what you plow with your harrow is on top aka above the surface (undisturbed dirt prior to tillage), I don't like the axles limiting my ability to cut as deep as possible. Getting the 20 give or take dishes solves that problem. 6" is where I like to go, below the surface when/if I can.
For a follow up I use a JD chisel harrow with shanks on 9" centers and 10" sweeps. Attached to that are 3 rows of spring fingers. I have posted pics of it on here in the past. It's home made in that I added the spring fingers for the smoothing effect and saves a trip with the spike harrow.
This makes for 2 passes and you go from dormant dirt to a prepared seed bed ready to drill.
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