My wife is an expat kiwi and we visit NZ every year since most of her family lives there still. We have also been contemplating a move back from the US, but housing prices (especially Auckland, but everywhere that isn't rural farmland is an issue) and lower salaries are the only thing preventing us, still. Auckland is an amazing city but it's so incredibly congested and expensive that unless you are wealthy or in the housing market already, it's very difficult to make a go there.
> Have you looked at Christchurch? Apparently the government is incentivizing companies to build there with the goal of making it the high tech capital of the South Island. I believe Vodafone has some pretty impressive plans for the city.
I was last in Chch a couples years ago, so it may be changing, but my impression was not great. My wife lived there during the earthquake and their recovery has been slow. I think it will improve, especially with increased investment, but it's probably years away from being anywhere like Auckland or Wellington again. Even 2-3 years ago the downtown area was essentially a ghost town from what I remember, and that's still several years post-earthquake.