RAAF First
Have to agree with TruBlu I think.....
after a couple of tours, you will have loads of experience (in some cases all military fast jet) and can apply to most airlines as a direct entry FO.
The pay is good compared to what you will earn initially in GA and as already mentioned, you will take a pay cut when leaving the RAAF to join the GA ranks.
Training is paid for as well.
Have a crack at the RAAF. Worth the risk.