If you can get a cashcard that will work in international ATMs (a Maestro one as a previous poster said) I would just take that, one or two credit cards and a small amount of TCs (AU$500, perhaps) in USD or euros for emergencies.
I've never had a problem finding ATMs in Europe and I just got back from a 6-month trip in Asia where ATMs are also plentiful, even in India. The only places I needed cash or TCs were Cambodia and Laos.
TCs are a pain in the arse and cost money to use. If you don't get charged comission on cash withdrawals, ATMs are the way to go. I know Australian banking has a very different approach to ATM use so you'd need to check.