Have only been away for a summer myself. I went to France and loved it, half thinking about going back for a longer stint.
I was in South Korea last summer for 6 weeks and its one of the most boring places in the world and next to impossible to speak the lingo + you'll get fed up of the Confeucian system quite quite quickly. Your friend will quite quickly be turned to drink (like all the other exPats) however he will still earn quite a few pennys for himself as your accomodation is paid by your employer and you are paid western rates, while the cost of living is low enough.
As for Oz, from what Ive heard from people who've been there and New Zealand too, New Zealand seems to be the one to go for by a country mile, still have to hear a bad word said about the place.
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