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I would be looking at slightly longer focal lengths than the ones you've quoted there, at least a 200/1000 (eg an 8" f/5) as a minimum. If you like looking at Jupiter you're going to want to have more flexibility in the range of magnification than the shorter focal lengths will give.
Yes, a 10" can be too big sometimes, although there's bound to be a few people come along and tell you to go that big!
Do get a sturdy mount, what ever you do! The steadier it is the happier you will be!
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