Depends - what do you wish to see?
Wide field or astro imaging - go for a ED 80mm refractor on a EQ5 goto mount.
Deep space objects and forget imaging - definitely a dob, add Argo Narvis later for great push to pointing.
An all rounder - easy to lug, good planetary - well a 5-6" MAK or SCT would be fine.
So it all boils down to 1) what do you prefer to see, 2) can you forego imaging to concentre your budget on aperature rather than precision of your mount and 3) is weight or portability a must have based on where you wish to use that equipment?
On that last point if imaging is a permenant set up in your back yard - or a carry out each night versus a lug to the top of a mount 5 miles away when you go camping each week - well a small refractor will win that battle!
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