Oh dear, that's a tough question... I know plenty of places to get good coffee beans here and in Cyprus but none downunder! You see, in my experience it's not just what coffee you buy which matters but also where you buy it from, because some shops can be less than honest about the proportions of each type of beans in their blends. For instance, Jamaican Blue Mountain is widely regarded as the best coffee in the world (it's certainly the most expensive), but many brands and retailers mix it to a greater or lesser proportion with other Jamaican beans.
Even when they don't mix cheaper beans into the blend, the frequency with which each retailer roasts its beans and the storage conditions they keep them in can make a world of difference to the state the coffee will be in when it gets to you. I can go buy the exact same beans from Whittards that I buy online, but the Whittards ones usually won't be as fresh.
I suppose you could just buy some of the better off-the-shelf brands like Illy or Lavazza, which are mostly a sure bet even though they won't be as fresh and scrumptious as recently-roasted fresh beans, and it seems a waste that you should buy coffee imported from Italy when some Australian coffees go for as much as £40/kg over here!
Your best bet is to hop over to the coffeegeek.com forums and ask for good places to buy coffee from in your area. They have regional forums and I'm sure there's an Australian one, though I can't check atm cause they seem to be down.