Hi Ken and welcome. Couldn't agree more with Liz and Nick. 8-10" dob would be a great scope and would do all that you're asking for. But you are doing the most important thing - looking through someone else's scope. I think this is essential for getting a realistic idea of what to expect.
If you travel to Melbourne regularly, Bintel would be a great place to look at for your scope and their own branded GSO dobs are very good value for money and have very good optics. And really I'd go 10" if you can afford it. They're pretty easy to move and you'll gather more light than an 8". Mind you an 8" scope is no slouch.
Hope you have fun with the scope and this forum.
Oh, and get a telrad with the scope. Makes a big difference when you're trying to find things. A very good accessory.
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