I know you are keen to move to Australia, but I would suggest trying to get some work experience in the US before you move, otherwise you might find it difficult to land a job in Australia. The US is more advanced in various technical fields than Australia, so that experience would enhance your employability when you make the move. I am just guessing, but perhaps your education could be applied to the mining industry. The mining industry in Australia is experiencing a boom and needs people with all kinds of different skills. However, you would then have to be prepared to live in isolated areas, which might not be what you are looking for.