US is having it's own problem with it's economy right now.
The prospect of finding job has become thinner, so you might have problem finding job at this time when you come to US at this time.
there is competition in all kinds of jobs.
The high tech job has already busted, which even so requires college degree and experiences, let alone the competition in every level.
There is even bigger competition in blue colored jobs. The huge influx of illegal immigrants from south and beyond, has further added to the pain of the job-seekers in the US.
so it would be hard to recommend US, unless you wanna bring your bank balance to support yourself in here until you find a job.
However if you have any close friend here and can show you, help you or give you direction when you come here then you might do just fine.
can't say anything about Australia.