LOL - so you guys started playing on the net after I left last night huh??
Re CAMS or AASA, its completely up to you and depends on what you want to use it for as to what you should get.
CAMS - $95/year - Level 2 Speed (L2S)
CAMS is most commonly used, and even when events are run by AASA, CAMS are still accepted. Will basically let you do any club level motorsport event in the state.
AASA - $50/year - Download the Club Racing License
AASA can be used at events when AASA is the event insuring body. Only used at Calder and Winton & also for some motorkhana events held at DECA and the like. Ie. SAU-Vic uses AASA insurance for our DECA motorkhana events held in Shepparton.
As I said, its completly up to you what you want to compete in. But if you think you might like to do a track day at Sandown or Phillip Island, then definately get the CAMS license.
Hope this helps.