Show me one that dosn't sell a 4WD these days, but try these:
http://www.montys.co.nz/
(Mainly expensive and shinny 4x4, good for show, school runs and ski bunnies)
http://www.nthcitycommercials.co.nz/
(I found this guy to be fair and straight shooting, mainly lite trucks/ utes and a few 4x4's, his 4x4's are mid range and tend to have after market mods)
http://www.enterprisecars.co.nz/
(Don't touch them, they know all the tricks)
Shackel Motor Company LMVD 4WD Centre 36 Ghuznee St Wellington.
(Haven't had much to do with them but I read in the paper they were sued for unfair practices or something)
Craig Lyne 4WD & Commercials, 100 Hutt Rd Petone Wellington
(No idea what they are like)
Certainly not all, but a few to start your list
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