If you're updating your sound system, are you concerned with sound quality, or will anything do?
If quality matters, get a good FM Stereo tuner as part of the new system. If quality doesn't matter, ...
If digital radio isn't up and running in Australia - wait! There are several standards being kicked around at the moment, and you don't want to be left with a Betamax digital radio in a VHS digital world.
The UK has been pushing digital for all it's worth for some years, although they seem to have stopped now. The sound quality and the signal quality are dire, and I wouldn't be surprised if the whole thing is allowed to die quietly. I'll even conduct its funeral for no fee (pro bono).