healthcare expenses
.... Though you do still have to pay the medicare levy.
I'm here on a 457 and we apply to medicare each year for a medicare levy exemption certificate (provide a copy of your passport and visa and fill out a form found online.) This gets filed with your taxes and you get a refund of your medicare levy.
As for insurance we use IMAN Australian Health Plans. 3 years ago the cost was approx $1400 every 3 months for a family of 5. Just got notified that it's going up to $2400 (I think it's because of our claims for orthodontist.) We have the most extensive coverage they offer and in the 3 years they have reimbursed EVERY medical expense we have had (including glasses/contact lenses for 4 ppl, dr visits, xrays, braces, prescriptions, etc.) They do have less extensive plans.
Another things to consider:
Some states (we're in NSW) require you to pay for school for your kids. We pay $4500 per year per kid to attend public school in NSW.