elo
it depends on where you go and what you do of course

australia can be very cheap, or fairly pricey (not pricey like sweden, but still, you wont feel like yorue paying for everything in pesos lol)
the best thing to do is search for travel forums where americans have already posted.
i think new zealand is def worth visiting, and is cheaper than oz by about 20% or so.
if you want a tip, from an aussie, about where to go to have a really good time cheaply...go to perth

all the good bits, few of the bad bits
ciao