To give you some idea of costs once you get the bike to NZ, there will be port importation fees for various agencies (about NZ$300) and assuming that all is ok with the bike during it's compliance and safety inspection (a bit like your MOT but tougher the first time and easier after that) about NZ$350 for that. That will get you a new plate, NZ VIN, one year registration and one year WOF (read MOT) assuming the bike is less than 5 years old. Over five years, the only difference is the WOF (warrant of fitness) is valid for six months. Included in the rego fee is the Accident Compensation Levy which will give you income and cover medical expenses if you have a vehicle accident. It's pretty cheap compared to most countries, for what you get.
Just make sure it's spotless. Everywhere. Take off engine guards etc. ANY dirt and they will put it through a commercial cleaner and that will cost. NZ is lucky not to have many of the nasties over your way and we hope to keep it that way.
Nigel in NZ
The mouth of a perfectly contented man is filled with .
-- 2200 BC Egyptian inscription