Went online to search Australia interest rates. Seems like 5.8% interest, 400k. Monthly payments 2.5k. Rent would be by your estimates 1.5k. I dont think you are gaining much, if anything by buying. Rent for now, buy when mortgage payments are on par with rent (or at least a little closer). There are hidden expenses (property tax, upkeep, headaches, yada yada yada).
WIA- For most of men, our time being masters of our own fate, kings in our own castles is short. Even those of us in the game will eventually succumb to ease of servitude rather than deal with the malaise of solitude