I'd download them for free off topomap.co.nz and see how you go with those first. I just use those and don't see any reason to pay for anything else. Between that and the free aerial imagery that comes with the GPS I'm not sure what more you could want.
I think Iposted how to get the free maps going on here a while ago but any hassles getting the maps going, feel free to flick me a message.
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