Posted in another thread, but likely useful for you too:
www.workaway.info
If budget is a major concern for you, you'll fare far better in SE Asia. And unless you go to the extreme North or Sourth, everyone you'll likely encounter in Thailand will speak enough English to get by - it's one of the most touristed countries in the world. And beautiful too. Oz is a great country as well, but it's pretty similar to Canada from a cultural perspective, and won't do much to push your boundaries. Europe is too expensive for you - unless you stick to Eastern Europe, which will also push your boundaries.
If you'd like something closer to home, central America (Costa Rica, Nicaragua, Panama) are excellent options not to be lightly overlooked.