I like "Advance Australia Fair" as an anthem I also like "I am Australian". "Land Down Under" is a pop song and is only a reflection of a select few.
The flag needs the Union Jack removed, I'm not sure what it should be replaced with, maybe the aboriginal flag.
It always makes me angry to see a state flag which removes the part of our current flag that makes it Australian, to insert the state emblem, but the Union Jack remains.