freitasm:chiefie: woohoo.. is there a Data-only plan with Apache/Telecom?Yes, there's is. Ask for the NZ$10/month plan if you want casual rates and no call plan (voice still available, but full price).
Best option here would be to buy it outright (no contract), on open term, Go Onebill as the voice plan, then choose an appropriate data plan. Then you get $10 text if required, reasonable voice rates for casual usage, and you can disconnect / change at any time.