Wow, I can't believe how expensive that stuff is out there!
The AC-100 kit which sells for $359 works out at about £175, in the UK it would be retailing at around $160 dollars - for that kind of outlay in the UK or Europe you would be looking at getting the same compressor & a mid range H&S / Iwata / Grex airbrush.
If I had to advise on either, it would be the AC100 kit - the Tamiya kit does have the brand name on it's side, but it's rechargeable battery powered, diaphragm (I think), unregulated & without a moisture trap. The AC-100 kit will be Chinese, but its uses a reasonable compressor.
A couple of things that you may want to consider;
I don't know what your import duty is like, but you could probably import considerably better kit for the same cost. Delivery cost from Europe or the US may be hefty (for the compressor especially), but I imagine that from Japan or the likes would be much cheaper?
If compressor noise isn't an issue, see if you can pick up a DIY compressor from one of the shed type outlets & import a decent brush.
Diving is popular in NZ - what about considering an air tank, could be cheap-cheap if you know someone in the game.