Sea rise maps

http://geology.com/sea-level-rise

 

At 7m wellington sees some problems but it is not as major as other areas of the world. NZ is quite hilly so some sea level rise isn't too bad geographically. 

 http://www.musther.net/nzslr/

 

Things start to get really interesting here at 80m, this is when Northland becomes a scattering of islands and Wellington is all underwater.