South Oz & Tas are cheapest for housing, Sydney & Darwin very dear.
In SA you can get a nice home for $250000., $170000 for a renovators delight . Mortgages about $200 -$250 a week lower end, they DONT include insurance usually, its cheaper if you insure privately.
To give you an idea, my home in the country at Wongulla is selling for $239000 (photos River Estates First National : - Mannum* | *Swan Reach* | *Walker Flat* | *Bowhill* | *Murray Bridge* | *Murray Bridge East* | *Mypolonga* | *Caloote* | *Greenbanks* | *Wongulla* | *Cambrai* | *Angas Valley* | *Blanchetown* | *Nildottie* | *Punyelroo) and would fetch about $300000 in Adelaide suburbs. Good luck