It is a bit hard to go past an 8" GSO from Bintel or Andrews communications.
Before you decide to get one though, have you looked at astonomical objects through a telescope? It is a great way to set one's expectations and decide on what might really suit you. The Astronomical Society of Victoria has a New Astronomers Group which you might find helpful. They also have a fleet of 8" dobs that members can borrow.
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