Pre-defined shipping rates within one country - how?

Hi there,
I've been tearing my hair out over this one for a few days now, and even after crawling the net for hours I'm no closer to a solution. Basically I have a customer that only ships within New Zealand, and wants the to select from a number of shipping options; ie, regular or courier, and which part of the country they're in. Currently they just have a drop-down, like this:

They won't be charging on number of items, weights, or anything else, just the criteria the customer selects getting tacked on to the final price - actually I want to disable any calculating completely. We don't really have any states or etc to consider either.

Now how on earth do I do that? I suspect I'm being rather stupid... =P

(I'd also like it to come up as a drop-down, but if I have to settle for radio buttons I won't complain at this point)

I actually just this moment found someone who's trying to do nearly what I am here : http://www.zen-cart.com/showthread.php?151291-Zone-Rates-one-country-two-Islands-two-rates, but unfortunately the thread died before the rest instructions could be given =\