Noel,
steer clear of the rex cadet scheme, it's nothing more than a scam to get and keep fo's for a long period of time.
if you have the academic quals/ability for the qf cadet course jump at it.
if not, ga is the way to go, and a great chance to really gain experience that will hold you in good stead for the rest of your career.
remember, cadets will not make a decision in anger for a long time, and when your time comes all the experience you have gained in ga along the way could save your bacon.. (this is not a direct dig at cadets, just stating a fact)