MIC310
Before you spend the money, make sure the school is CASA approved, not all are. It is far easier to get A320 onto your Aussie licence from another licence than it is from training records.
If you are going to the States for a rating you may as well do the FAA ATP as well. The modest extra expense gives you another licence and an easier time when it comes to converting.
However if you want to work for Jetstar or Tiger you would be better off going to Alteon in Brisbane.