June/July is actually Sydney's winter, so it will be cool, and it does not get too hot in Hawaii. I checked the airlines and the temp/pressure will be the same as in the cabin. It doesn't matter if I was on the flight or not, the puppy would have to fly in cargo. It will be a non-stop flight, so he should be fine.
The "brown" ones look like they will end up being fawn, they look really light right now, and will only lighten more as they grow. Looks like you have a beautiful selection. I don't think you will go wrong with any of your choices.
WOW that is going to be a hard choice lol. For me if I had to pick right now it would be the one in the middle in the second row with the two circles and it looks like a diamond on the left side how precious......