Hi there, we originally wanted to go to Perth after spending so much time there but our visa only allows us to go to Adelaide, ow we wouldnt have it any other way. For us its the family appeal, everything really does seem to be geared towards families and we can't wait to bring our two up there. Also it is still cheaper than most of the other states, especially Perth which is now just as ridiculous as the UK. Finally its the size and population, there are more people in Greater Manchester than there are in the whole of Adelaide! All that space and of course the weather.
Hope this helps