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A few years ago I had a GSO (branded Revelation here in the UK) 12" Dobsonian and found that, while the optics were decent, I had to do a few mods to get it to work as I wanted it to. Chief among those was changing the primary mirror cell springs from the existing, very weak, ones to a heavy duty set, changing the collimation bolts and getting a set of 'Bob's Knobs' for both the primary screws and the secondary ones. All this made collimation much easier and I wasn't having to re-align the mirrors two or three times each session.
I now use an 18" Dob from UK scope maker David Lukehurst, which is excellent in every respect, but - obviously - that's not going to be a practical option for an Aussie. Australia's custom-made SDM scopes look really good and, if your budget stretches to it, go for a premium model like SDM.
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