If you are after a plastic pistol popular flavours at the moment are SIG X5 or Walther, although you do feel a bit ripped on the pricing in NZ for these and you have the option of easily dropping an optic on top if you want to from the factory. Have'n t seen any trigger kits turn up in NZ for X5 yet though.
Alternatively Glock with trigger kit upgrade like a Zev, XDM with a Powder River trigger upgrade or the M & P with an Apex trigger upgrade.
Try to follow what the yanks are doing with the production pistols and not such a good idea to stray too far, the main ones will have all the drop in improvements that make them good pistols and stay inside criteria.
Alternatively a CZ or 2nd hand Tangfolio, both nice pistols and what most would use in production ipsc but one thing I didn't like that could pick a hole in the CZ is the slack, take-up on the trigger. You sort of have to prep it a fair bit.
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