I don't see much mention of ICONZ on GZ. Not sure why that is, but here for comparison are their new plans with various "Maximum Speed" options:
http://www.iconz.co.nz/adsl/index.php
The plan that most interests me for use at our office would be ADSL3 because we only use 1-2GB per month, but need the high speed for file transfers.
Pricing seems very similar to others like TCL, Orcon etc except there is no requirement for tolls in order to get those prices (unlike most others who will add $10 if tolls are not included). This gives a little more flexibility in allowing you to shop around separately for a toll provider who best services your calling requirements.

