True $10k for housing isn't a lot, but we're talking about a $45k package. You can get somewhere decent to live for not hideous % of that. Admittedly, to have enough left over to enjoy yourself, you wouldn't want to spend more than $15-$18k. Dare I suggest that you chose to live out in the New Territories? For the kind of money you're paying in, for example, DB (I know, I know) or even the pilot haven of South Lantau, you'd get a really pretty comfortable pad. That $15-$18k in those places would get you 1000sqft or so.
Are all banks no longer able to offer 90% mortgages now?
You SYD pad sounds pretty tidy.