I may go against the norm here and suggest a secondhand 8" MAksutov or SCT, either on there own mount or standalone OTA with without heq5.
I don't think a dob is really for a unit..even though you are moving to a house soon.
you can buy a focal reducer down the track, and start with some piggyback camera work to get started
Though the 4" ED scope will still be a good option
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