Already know where I want to buy, I want to buy just an investment property back up home to rent out. Can probably pick up something extremely basic for $300K (like a unit or a duplex type thing) but loan calculator reckons I can borrow (25 year loan) about $233K (If I don't include any monies taken as rent from the property) and $389K if I do (given on what the real estate says examples pull in rent. If I wanted to get a house that was say $340K I would need to have saved like $50K though wouldn't I? (as deposit and all the other shit that goes with it).
Good thinking...
If investment, which is what I did for my first house, then you lose the first home owner's grant unless you live in the house for 6months in the first year... 
If buying as investment, then yeah, you can consider the rental income as part of your income, but best not to cut it too close...
I would think you would be able to borrow tonnes more???