The other option is to try a few different eyepieces through a 10" dob and decide what you like. Based on my experience I think you are looking at the right focal length range. I started with a 20, 9 and 6mm. Didn't get much use out of the 6 until I put the tube on an EQ6.
Where are you located? There are plenty of people on this forum with 10" GSO dobs.
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