Welcome Aboard!
A dobsonian mounted reflecting telescope will work well to see the things that you are interested in. In general, aperature rules but do keep in mind that the right scope is the one that you will use. A huge light bucket that is too big for you to move around easily is one that might not be often used. In my book that makes it the wrong choice.
A couple of things to keep in mind to get great views from a reflecting telescope is that the mirrors will need to be cooled and aligned (collimated).
A poorly collimated scope that does not have an "ambient" temperature mirror will not give particularly pleasing views. Learn how to collimate (it is not hard with some practice) and allow your scope to cool before use.
You noted that you may have an interest in astrophotography. A reflecting telescope can also work for this use if it is properly mounted. A Dobsonian mount is great for visual use but not as good for photography.
If that is your "end game" you might consider a solid tube reflecting scope over one of the popular collapsable types. A solid tube can very effectively be placed on a mount suitable for tracking which is needed for astrophotographs.
I'd strongly encourage you to go to a viewing night or two before you buy a scope. It is a good way to understand some of the tradeoffs between scope types and will help give you some ideas about which scope will best fit your style and interests.
There are many good clubs around Australia filled with helpful and knowledgable people...don't hesistate to take advantage of that resource in addition to good folks here at IIS.
Clear Dark Skies to you!
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