In Melbourne I would think at least $350k depending on what suburb you live, some would be higher than that.

We moved regional to make it affordable for me to be a SAHM as it wouldn't have been possible if we stayed in Melbourne with our mortgage, I would have had to return to work to make ends meet.

We purchased 4yrs ago in a tiny town 30mins from Ballarat and our mortgage was approx. $100k less than our mortgage on our Melbourne property.