I am not from NZ, but I spent 7 months there as a groom for eventer Donna Smith and in a personal yard for the Brooks family.
The McVeans were my first thought. They breed beautiful horses and every horse I have ever seen with her is just pure quality.
I highly recommend Joanne Bridgman - she breeds beautiful horses and has an excellent eye. Her horses could easily be straight jumpers. She is mainly an eventer but has a ton of connections and could set up a nice trip for you. She has sourced multiple horses for folks like William Fox-Pitt.
I also recommend taking a trip out to Donna Smith’s. She typically has around 40 horses in her yard and can show you some nice ones. Again, she is mainly an eventer. There was a show jumper that she got a GREAT horse from - something like David Goodwin. He lives near her. Based on that one horse (named Balmoral Sensation), I would take a look at his for jumpers.
I love the little hot NZPH ones.
Henton has FABULOUS horses that tear it up in multiple disciplines. Donna had a great one when I was there - Henton Executive - who was basically an amateur horse that went to 3*. She has a 2* one Balmoral Henton that is super nice. Lizzie Brown’s top event horse is Henton Attorney General, and he is one of the best jumpers I have ever seen. Sam Felton has a nice one too - I believe Henton After Dark.
I definitely would have brought some back, but the flights are just ridiculous. I got an advanced horse for US$14,000. Just so much cheaper than they are here, and he was so sound.