I'm not really experienced enough to give specific equipment advice, but I can tell you that it's likely you'll either need to spend more money, and/or to limit your expectations more than you expect. At least you seem to be aware that there's "all the small extra's you need" as they can add up.
To start with, if you've got a DLSR already, you can use that to "save" money in your budget. You can learn a lot with it before perhaps moving on to modding it or CCDs. This is basically the path I'm taking at this time - I'm using the DSLR, but eventually I'm going to go the full CCD route.
If you've got access to 240v, you can save some initial spend on powertank/batteries until you get the rest of your gear sorted and can do better power usage calculations.
One piece of advice I took from this forums/net research was to not "skimp" on the mount. For my setup and budget, the G11 was a stretch, but I'm glad I made the effort for it. I do not have a permanent setup, so it's manageable to carry around and setup where required. If you are going mobile, make sure you can handle the weights involved.
As you do your research, you may find that some brands are obnoxiously expensive in Australia - if in doubt cross compare with overseas prices to check. The classifieds here tend to have a lot of gear, so second hand might be the best way to go to fit the budget.
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