i started with 65k/annum exclude super, a family of 4, getting centrelink support. hmm, comfortable ok just need to keep an eye on every cent u spend.
my case during that time in perth as below:-

rent (2x1 apartment) - $300/wk
electricity - $150/fortnight
groceries - $150/wk (got salmon/cod, pork, beef, fruits, veges, milk....almost everything. enuf for whole family for a week)
clothing - $100/mth
fuel - $50/wk
phone (2 mobile) - $120/mth
internet - $80/mth
water - none...i dunno why coz no bill and i chase agent, they have no idea too....

income after tax is $1250/wk after tax
Thank God that groceries and clothing is cheap here...

Medicare covers the cost of GPs.
Emergencies and public hospital (with long wait time) is covered.

Private health insurance (to cover non urgent surgery, optical, dental etc) is exxy. Approx $250 pm.

Come to think abt it this was not one of the costs listed above.

a lot meh? i used one of Bupa's online quotation, seems like quite a complete family cover, its around AUD400/month...