Hi Simon, I'd narrow down your options to an 8" or 10" dobsonian or an 8" schmidt cassegrain - people often trade up from 8" meade LX90's or celestron nexstar 8SE's so a wanted ad for either of those would save a significant amount off new.
The 8" scopes of either design are quite portable; the 10" dob is slightly less portable but still not hard to move around.
The two schmidt cassegrains find and track objects for you, though a standard dob would not be at a disadvantage in that regard if you were going to be observing with others who could help you.
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