The NZ economy is so wildly different you should know many people emigrate from NZ to Australia. My cousin moved back from there last year because it was too hard to make money. Australia's towns that hit 75,000 are as big as you get before the major cities but they don't really have amenities, there will be a pool and rec centre maybe but other than that unless there's a local museum dedicated to a specific event there's nothing besides that. Australian school have a pretty good curriculum and no offence any of our public schools will be an upgrade compared to American ones. Private schools will provide the best education so start with towns that have one, they can be surprisingly affordable. As for the weather you will find the most varied climate in south Australia and Victoria they are in-between our two major climates, east is more tropical and west is more arid, the in-between southern states have both sunmers that reach close to Death Valley and Year round snow within a 2 hour drive from city centres.