My biggest piece of advice for your immediate financial future, don't get caught up in the expensive wedding craze!!!!!
Soooo many people get sucked up in all of the pointless expenses that just take away from the real meaning of the day. Trust me 10 years down the road (or honestly 10 days down the road) paying an extra $2,000 for the name brand dress, $1,000 to hire a limo, $5,000 to get married in some massive fancy place....it's just not worth it. A lot of "middle class" weddings are $20,000-$30,000 these days, and they can't afford it. My favorite wedding i ever went to cost under $3,000, and they supplied food and beer to ~300 guests!!! if your parents were planning on paying for it, or chipping in, ask for a check instead :)
O, and if you aren't engaged yet, same goes for rings, no need to spend $5,000 on a rock.
i don't know anything about NZ real estate, what does $600,000 buy in Auckland? The most simple rule of thumb in the US for how much how you can afford is 3x your annual salary (before taxes), and of course a mustachian would do their very best to be as below that as possible. Your before tax money is about $110,000 (unless you are taking more deductions to get to that $80k you cited other than taxes) so you are pretty far above that general rule, and also had an extremely impressive down payment for mid 20s.