Best card to use abroad (as a Brit)?

Hi,

I'm a Brit currently earning some money in Oz on my first holiday visa.

I intend to do a bit more travelling (in South America) in between visas, so will be using $s as my currency, not £s.

I'm currently with Commonwealth bank but do not want to get destroyed by bank charges like I did on my last trip (with Natwest) when I originally left the UK.

I've heard about the 28 degree card or whatever it is but it's for Aussie residents only. Is there something for us backpackers or am I better off transferring the whole lot back to my UK account and using that?

Not going away until Feb but would obviously like to know in advance.

Cheers.

Edited by: Chezdon