Check out ALL ATPS --
www.allatps.com Drop them an e-mail and I'm sure they can give you advice. I came out of the military and got my ATP there. Very fast program that concentrates on just what you need, nothing more. You can do an ATP in about 3-4 days, including the written exam. I would recommend that you get a copy of the software from Gleim that replicates a FAA written exam -- good to see the format. Since the FAA releases the questions, you can study them via the software. On the exam, you just don't know which of the 1300 or so question will be on the 80 question test.
Working in the US maybe a different questions altogether -- do you have the right to work in the U.S.? If not, you're probably better off saving your money and getting work in OZ.