Johnra - I went to Australia last May. It was a great time. Airfare to Australia from the U.S. depends on where you are flying from. Generally it seems to run about $1,500 if you fly from from the east coast of the U.S., to maybe $1,000 to $1,200 flying from the west coast of the U.S. Not sure where you are flying from? I spent a lot of time watching fares and they do not seem to change too much (maybe $100 up or down or for last minute fares, but I do not like to wait for a last minute fare)....but keep your eyes open and maybe a sale will pop up. I flew from Boston to Sydney on United(through San Francisco), btw, and it was around $1,500. good luck.
"Those who would give up essential liberty to purchase a little temporary safety, deserve neither liberty nor safety." Ben Franklin
"The plural of anecdote is not data"