I saw this here in Sydney just a couple of weeks ago (although obviously with the Sydney Symphony Orchestra, and in the Opera House) and thoroughly enjoyed it.
You seem to be forgetting GST, which makes it ~$2200. Also keep in mind that if you buy it in the US you'll be paying sales tax, and that likely if you have mailed to you in NZD you'll pay GST as well.
Having recently done this (being the sender) shipping with insurance is going to suck a good chunk of the difference too.
(I'll also note that model is actually cheaper in Canada - NZD$1840 vs NZD$1887, oddly enough.)