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Hi Theo and welcome,
There are many great objects to view in our night sky with the apertures you suggest.
I would highly recommend that you look up the nearest Astronomy Group in your area for guidance. At your stage a "Star Wheel" would be a great investment to help find your way around the night sky.
Dobs are great configurations for beginners, the most bang for your buck, so to speak. They are easy to point and give pleasing images.
You are at the start of, hopefully a long and satisfying journey, in astronomy. Dobs, at low to medium magnifications are really excellent to tour and admire most of the deep sky Jewell's of the southern sky. Low power = wider field of view high power = narrower field of view.
Using high power in a scope that does not track will mean having to reposition the scope for each observer, however that is really only for solar system objects. For deep sky objects you will use only medium to low power and so not tracking is really not a problem for optical observing.
Regards
Trevor
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