Well... You're here from new moon to full... Doesn't make much sense buying a scope as you'll only have a few days after you arrive before the moon spoils the deep sky stuff.
The other thing is the weather in the blue mountains west of Sydney has been consistently abysmal for stargazing on the nights that matter.
Maybe better to join some of the locals for an observing night on a Saturday close to new moon; if the weather permits; that way you'll get to use a scope bigger than you can accommodate and a knowledgable guide.
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