I have a UK DAB headunit in the shed. It's a Blaupunkt woodstock. Unfortunately Aus went with a different technology for DAB than Europe and the US, so headunits from over there are useless!

Sydney has had DAB broadcasting for some time now. Check out some of the online stores over there to see if they have compatible units. I know Alpine and Kenwood do a separate box that plugs into their units in Europe. Not sure if they've modified them to work with Aus ones yet.