Hello everyone I've been lurking a lot these past few months, not part of the 'gang' as it were but still grasping tid bits of NZ going on
We had our trip back to NZ over Xmas / New Year and it was fab, really really lovely to be home... even a nasty bout of chicken pox (DS 4.5yrs - vomited for 5 days), thrush for me (awfully humid that country you live in), a staph infection for wee DD (minor and easily fixed but grrrrrrrrrrosssssss) cant sway me from claiming a great holiday!
I just had to pipe up with my 2penny worth with regards to the Waiheke dilemma... AB dooooooooooooooooooont doooooooooooooooooooo itttttttt
Okay, that's probably not very supportive or constructive but honest to goodness noooooo nooooooooooo nooooooooooooooooooooo 
I own some of the biggest NZ branded rose tinted glasses you've ever seen but living on Waiheke would be hard going and you are already in a situation of low support on a day to day basis and have had a horrifically rough year, you deserve to be able to voice your reservations to your DH and for them to have precedence over his enthusiasm or at least for them to taken very seriously.
I think you guys would really love Beachlands, its far enough away from CBD that you feel like you are out of Auckland almost but 15 mins over the hill (Whitford) you are in East Auckland (Botany / Howick, another 10mins to Sylvia Park, airport is about 30mins), CBD by car is about 40mins (non rush hour), your DH can catch ferry to CBD if he'd rather, Shelly Bay beach and Maraetai beaches are really fantastic, I saw several day care / nursery options offering the 20 hrs free, the school is really nice from what I saw, the Te Puru community centre has all the sports you need for adults and kids and there is a coastal walkway that goes for miles ( has off leash area for dogs, bush walk, walking/cycling path). My FIL commutes from Beachlands to the North Shore every day, that is a huge commute (1hr 15mins each way) and he does it happily as he loves living there (only moved there three yrs ago).
Okay, I'll get off my soapbox now but I just wanted to butt in and add another voice to those already who have said be cautious of a move to Waiheke... there are so many lovely, less city like areas in Auckland... Titirangi is beautiful if you rather bush than beaches (tho it might have those too I've only been there a handful of times!)
As for us, we are in 'ducks in a row' mode, we figure its best to get ourselves sorted over the next six months or so so if an opportunity arose we would be in some kind of position to take it but realisitically it'll be another year or two before we go back... I'm DETERMINED to have my 40th birthday in NZ (3yrs away). It was easier to see the rough around the edges parts to NZ life this trip, its an expensive place to live and salaries are not overly generous, NZ drivers are impolite and need to be taught how to drive on open roads / motorways property and its harder to find a really good steak and cheese pie than it used to be but those are some of the prices you'll pay for the opportunities that are available