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You can't go too far wrong with what you're considering 3x3s. Keep in mind that 'Dobs' are newtonian reflector style telescopes. Read up on collimation before you buy (seeing as you have the time). It is not difficult, though it can be finnicky. The purchase of a collimation tool (don't be too fussed about the nomenclature) will help considerably when it comes to putting into practice what you learn. Recommendation? probably a Cheshire rather than the laser unit - but I'm a bit biased so don't take my words as gospel.
Whatever you do, have fun. Welcome to the Club of Nerds.
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