Let me tell you what I know about SIS since I am studying in CDNIS and im 16
SIS is not a bad school, as a matter of fact I have a lot of friends studying in SIS.
They are all sweet and cool young gents and ladies. Other than the fact that, yes some of them might be a bit rude, but cmon they are teenagers, I would be lying if I tell you I havent swear in my whole life. They only down side to SIS is its not really a huge school,and some kids there are kind of spoiled. But think about this, if you choose that school you were talking about in aussie, then It would be the same as those top schools are usually posh and you know.... Hong Kong is a safe place, if not one of the safest place in the World. Also ESF schools have a pretty good record for they IB course.
If I was you, then I would definatly come to Hong Kong, and your husband is in Hong Kong... CMON HAHA WHAT ELSE IS STOPPING YOU??
Hong Kong is also a lot smaller than aussie, so its easier to look after your daughter.BUT BUT BUT, I am sure you would find as much fun as you are having back in aussie..
This is just a perspective from a 16 year old teenager boy who is also studying in Hong Kong, in an international school.. no biggie not important .. HAHA
just so you know There are a lot more options in Hong Kong in terms of job wise.
Hope this helps
Edward