You won't have any problems with the G5, but you will need to flick the switch on the back.
Having said that, depending on your time frames, shipping/baggage costs etc etc, I would think you would either be better off renting for your time here if its short, or buying and selling one while you are here it is longer term.
It pays to remember that a G5 (mine at least) is a 2 man lift, with of course, little guarantee that it will be in the same condition when it lands.
And yes, let us know of any work down under
Heh - good luck with your project.
Justin.