http://one-salient-oversight.blogspot.com.au/2009/03/income-taxes-australia-vs-usa.html
You may find the discussion on this site of interest.
I still think many Americans who would consider going to Australia would still find the nation way, WAY too culturally liberal - for examples in their beliefs on guns, abortion, homosexual rights, sex ed in schools, drugs and so on. So I think conservative Americans like us would find that a huge turn off if we actually went there.