I think in some areas NZ is more expensive, but I also think it's a bit overstated. For instance, flights can be quite expensive if you don't book well in advance. A flight from Auckland [top of Nth Is] to Dunedin [Bottom of Sth Is] can cost anywhere from NZ$100 to NZ$500 one way depending on when you book [that's about US $75 - $380]. So if you book a holiday a month or two out you'll be fine, but if you leave it till 2 days before you'll be screwed.
A lot of people complain about the price of groceries, but if you shop smart you can save a lot. Every 2 or 3 weeks I shop online at Countdown and I buy the items that are on sale in bulk. So if brands of beer, beans, cheese etc I like are on sale, I buy double the amount I need. Then next time when I do a shop these products will be back at full price, but I won't need to get them because I have extra, so I get double of some other product I like that is on sale. If you do this you can make big savings. I typically get about NZ$400 of groceries for about $300 in this way. There's a delivery charge, but if you get over $250 its only NZ$8 which is worth not having to do the shopping yourself and you still make about $90 savings.
http://www.nzherald.co.nz/nz/news/article.cfm?c_id=1&objectid=10667773
Other stuff like books etc can be expensive. A lot of people now buy overseas from Amazon and have it shipped here. It's cheaper and I've even heard that it can be quicker than ordering from local stores [if they don't currently have the title in store]. Also the Warehouse [its kinda like Walmart] has great sales. I often get 3DVD movie multipacks for about NZ$6 - $15.
It's debatable whether Auckland housing is expensive or not. Some people say it is, but if you compare it to say New York, London, or Paris, its good. I think a lot of it is relative to salary.
http://www.3news.co.nz/NZ-tops-most...house/tabid/421/articleID/195504/Default.aspx
http://www.nzherald.co.nz/business/news/article.cfm?c_id=3&objectid=10745628
If your in IT the biggest grip you'll have is broadband prices and data limits. Telecom NZ is the main provider. Have a look at their website. Having said this there is a new pacific cable being laid in the next few years so that should bring more competition and better deals.
Overall NZ's a pretty cool place to live. It's a pretty laid back country. If your going to live here, Auckland is definitely the best place to live. Nice warm sunny summers [though it can get quite wet in winter]. Each year its ranked amongst the most livable cities in the world
http://www.nzherald.co.nz/nz/news/article.cfm?c_id=1&objectid=10748419
A good way to get a feel for the country is to have a look at the main NZ news sites below.
http://tvnz.co.nz/
http://www.3news.co.nz/
http://nz.yahoo.com
http://www.stuff.co.nz/