one big expense you forgot....
OSR Land Tax, on 550k building im sure that there would be a land tax of say 2-3k per year....
but yeh agree, there all diff opportunities out there at present....
just protect yourself with cals on best fixed rates iunstead of variables bcause if market moves could be dangerous.
with your massive cf+ im sure you'l find some $$$ to cover the $40 neg pw tho