Some additional costs you will need to factor in:
Electricity - $100 p/m (if you use gas heating)
Gas - $50 p/m
Water - $50 p/m
Petrol - $60-80 p/m (I drive a small car and mostly use it on weekends)
Public transport - $125-170 p/m (depends how far you live out!)
Clothes - $50 p/m...