I agree with John that a 6 or 8" dobsonian would best fill the void this classic will leave. Refractor-wise, I've had great results from my 102 f/11 ED on a manual altaz mount and surveyor's tripod, so a 4" refractor can give a very satisfying experience. I mention the f/11 because I too use it strictly for visual and the long focal length makes it very pleasant to use while still not being too unwieldy.
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