Having lived a few years in Palmerston North, and heavily fly fished the area, (Manawatu/Rangitikei/Pohangina) I think you will be better served, with a med/fast action fly rod in a six or seven, reason been, this area of the lower north Island, Wellington/Manawatu can be quite windy for weeks at a time, generally if we have a weather system called El Niņo, this will have domaniate winds from the west, once every few years we get a La Nina pattern, and weather coming in from the east coast, hotter drier and more settled.
Also sum pretty good river mouth fishing in the area, that might see you into trout and kawahi, esp during the white bait season, a secondary reason for a 6-7 weight rod,
Have a look on trade-me for used fishing gear,
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