quickymart:
You'd be far better just to get a router here - no chance of it melting due to the different voltages too plus they would be covered by an NZ warranty; imagine what a pain it would be if you had to send your router overseas just to get fixed.
UPDATE: You are correct, The Apple warranty is valid only in the country of original sale (exception is that EU is considered one country for warranty purposes). I received some dodgy info elsewhere, apologies.
All but one of our products (Time Capsule) is out of warranty in any case, so it's not a big issue, but I wanted to correct my error as I'm unable to edit my earlier post.
Cheers!