NZ is more expensive than America I think. We recently moved from The Netherlands to NZ. But keep in mind that taxes are lower here as well, at least compared to The Netherlands. Highest rate is 33%.
Wages are a bit lower compared to NL. Only way to find out what you are worth is to apply for a job and see how it goes.
If you have posted 5 posts, you can send me your CV. I can forward it to our recruitment department, as I work for a large IT company in NZ and I know exactly where to send your details.