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Hi Andrew,
I'm also in the Logan area, on a hill (neighbours?), and in my experience a 5-6mm eyepiece is about the limit of magnification on a 10" dob you could use before the image quality starts to decline pretty rapidly. With this you should still see good detail on Jupiter and some banding on Saturn in good conditions. The lower power eyepieces will also give you good views of DSO's, although if you're anywhere near the logan motorway/pacific highway, investment in a decent OIII/NB filter will help a lot with nebulae.
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