shnee -
I wouldn't hold out a lot of hope. There is still quite a pool of qualified pilots already here in the U.S. who are looking for work. You also have to have a permit to work here, and that can be difficult unless you marry a U.S. citizen or permanent resident.
I don't know what kind of reciprocal agreement our FAA has with the Australian licensing authority, but I believe the only thing you would qualify for "automatically" with a foreign CPL or ATP is a private pilot license. Not much good for getting work, and I believe it is done that way intentionally. I'm not sure what upgrading your license to equal status with your Australian licenses would involve. My guess is it won't be cheap.
At your experience level (with usable licenses and valid working permits,) you could likely land an F/O slot with a regional/commuter carrier flying turboprops or small jets (like the EMB 145.) Pay would probably run from US$25,000/year to $35,000/year. Working conditions are relative to the particular company. Some treat their pilots fairly well and have reasonable schedules. Others think you are their slave and provide commensurate treatment.
Good luck, and g'day mate!