I would have gone for Wellington rather than Auckland. There's been several large success stories out of Wellington and there's a fair bit of VC cash, they're trying hard to get a good startup culture going. Tons of tech companies there. Excellent (really, truly wonderful) coffee.

The downsides are occasionally (OK, often) hideous weather and potential earthquake risks.

Auckland is a nice place but has horrible traffic, near-useless public transport for some areas and is about to go through a total shemozzle of a local government reshuffle, which may drag things back a bit.