As a fellow Aussie, the dual boiler often goes on special on Oz bargain. A friend bought theirs off there for $800 AUD.
I got mine for half price at boxing Day a few years ago (paid $1000 AUD) from David Jones of all places.
The other note is servicing. I've been told it's wise to have the breville machines serviced every two years or so. They replace the seals n so on which is helpful. You can do it yourself but there is a bit of mucking about.