We pay $3100 per month plus an extra $50 per week to make up for the shortage between mortgage and rent for our investment property.
We could do it on one wage but it would be extremely tight so I would be looking to take a year off when we have a baby and then go back to work part time.
It was important to us to stay in the area we were used to as our family and friends are here and I didn't want to be isolated from them. Plus we love living here. It sure is $$ though. We don't even have a proper house. Just a 3bdrm unit. : /