Salary for senior positions varies according to tech stack.. but I believe it's above 90K NZD per year, maybe something between 90-120K full time employee.
There are some jobs posted under this threshold on trademe and seek, but if you look with calm, especially after the end of the financial year (july for most companies), and around Feb/Mar, there are normally positions open here in Auckland with the salary.
A friend who emigrated in 2005 and bought a $400k house, great move (especially as he paid cash from equity in his 3 bed terrace in Kent). Still expensive to live there (especially if you want to see family on occasion), but it seems the opportune time to immigrate has sailed.
Depending on tech stack, senior positions range from 90 -> 150k, houses ~ 1mil