Your pricing sounds good assuming your services are up to standard with the competiton. I have to admit that when comparing hosting with offshore offers, NZ is generally more expensive. For example, My NZ host for http://www.insites.co.nz
only gives me 50mb space for $15 a month where as the site I host http://www.ondemandmentoring.com
in the states is US$4.95 a month for 1,500 GB! of space and a free domain - top that if you can???
So if you're just marketing to NZers, you should do Ok.