Hi J, welcome to the forum.
Ellis Utting seem to be pretty reliable dealers, so you shouldn't have too many hassles buying there. They sell a lot of MX5s.
A few things I noted:
1. Colour is a personal preference - I like the blue personally, and although that one isn't a very rare colour, it certainly isn't common either. Common colours are usually cheaper.
2. It is an auto. If you are looking for an auto, that is great, but a lot of people find that a manual MX5 is a lot more pleasurable and fun to drive, and some are even disappointed when they have bought an Auto then drive a manual later. Don't let anyone put you off buying an auto if that is what you want however.
3. Ellis Utting say "the car was personally inspected in Japan by one of the speedo certification engineers before we aquired it" etc so it seems like a new import. This is contrary to the 'club sticker' note. I believe that they may have been given a bunch of club stickers in the past and put them on the cars to help promote the club, so it probably is a direct import, with no NZ owners. I could probably tell if I saw which sticker it was (can't quite see)
4. The NB (or second model) had a facelift in 2002, so this is the facelifted model.
5. It looks to have a fullsized Japanese stereo. It may or may not get all NZ FM stations... and there may be other functions that don't work in NZ? Dunno.
6. It comes with a hard top - this is a bonus as often they keep these and sell separately. Good ones sell for up to $2k and fit the previous model too so you can flick these to recover a few $ if you don't need it. Hard tops are only really needed (IMO) if you regularly park in dodgy areas. Hard tops that are colour matched do give the MX5 that 'coupe' look though, which is nice for a change sometimes.
7. It is a 1.8, which is the larger engine size. Some NB import models are 1.6L (as were the original NA models up to 1993)
I don't know a great deal about the NB model specifically so can't tell you much else. Someone else may be able to check the pics. I also can't really comment as to the price. It sounds a bit high to me, but it is from a dealer and is not... red, and only 5 years old. Incidentally, that is about the exact same price as I paid for my 1994 - five years later...!
Is it at Ellis Utting in Panmure?
There is a FAQ item here (mainly with links) that shows some things to look for with buying an MX5
http://www.mx5forum.co.nz/viewtopic.php?t=2938
Other FAQs of note are here:
http://www.mx5forum.co.nz/viewforum.php?f=27
Hope that helps
Cheers