Another factor for point 6 to consider is do you expect to be showing things to other people regularly? We often have neighbours or friends over for some star gazing and I think they would find it difficult to track a planet at high magnification. Of course, you could use a lower magnification in these cases as they would be happy enough just to SEE Saturn's rings and Jupiter's moons! A mount with a drive in these cases would be an advantage. Mine has a motor driven EQ mount so I can't really comment on this subject with much authority, I am sure someone else can give a better evaluation on how "outsiders" find using a non driven mount.
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