Hi Dawn
As investors feel the Auckland market is hitting a plateau with the average house price breaking the $1M barrier for the first time, Wellington - although it's median Sept 16 house value is much less at $480K (http://www.interest.co.nz/property/house-price-income-multiples) , prices are rapidly moving upwards as those investors move away from Auckland to the other main cities looking for growth and return with a 21% YoY increase (Sept 15 - Sept 16), compared with 15% in Auckland.
When you relate those prices to median NZ household incomes, Wellington sits a 5.17 multiple and Auckland metro currently at 9.24.
As Duncan has suggested qv.co.nz is a good resource for market trends and neighbourhood prices, a resource like homes.co.nz is also good for looking at particular property price estimations.