Whereabouts are you fishing? North/South or both?
For South Island I take a 9 footer in a #5 and another in a #6. The #5 sees most use. Your #7 would probably do at a pinch, I just prefer lighter, less powerful rods.
I take a #5 and a #6 floating line, but usually use the #6 most of the time. A sink tip is useful for streamer fishing and I take an intermediate too, in case floods dictate that I have to end up on the lakes.
Make sure your reel has a good drag and takes plenty of backing. Sometimes it is needed.
What else? Waterproof camera, good polaroids (I take 2prs amber and brown), decent sized net, a folding wading stick. Good boots with studded Aquastealth and that is about it.. You may find a buff and sungloves useful as protection from the dreaded sandflies if fishing west of the divide on South Island.
Have fun.
Alex
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