Just remember you will be paying 7 point something % interest on that student loan if you leave NZ.
I have some Aussie mates who decided against training in NZ because after the interest, travel, accomodation, a car, etc etc it just wasn't viable. Also the big one...the 50 hours extra required for an NZ CPL.
I'm not trying to put you off, I would love you to come train in our beautiful country and inject badly needed $$'s into our economy, but think about it
As for IAANZ, I didn't train there but I did train in the helicopter school about 100 metres down the road about 4 years ago. I had a few lectures there so I got to know a few few people training there. As far as I can tell it was a very good school, I never heard anything negative mentioned about the place. (Mostly) Modern fleet, very nice buildings/ facilities etc, friendly staff/instructors (don't know anything about experience levels though), amazing mountains fairly close by, brilliant cafe serving fuc*ing amazing pies. That's about all I can tell ya.
Good luck