TammyD - If I were you, I will get Birkin from Paris and HAC from my local H store.
TammyD, I second what Amanda has said. Focus on a Birkin in Paris, because a Birkin would be a longer wait in Singapore. A HAC will be available to you, if that is what you want, so long as you establish a good relationship with the store (which you already have) and continue to reiterate what you want. I have come to realise that the Singapore stores are no different from other H stores around the world (with the exception of Paris where Birkins are everywhere), in that if a customer is out of sight for a long time, the customer is out of mind as well. Conversely, if you constantly visit the store you like, and establish yourself as a serious & loyal customer, you will more likely be offered to view the bags you desire.
A 32cm HAC is definitely on my agenda for 2007

.
And if you would like to try for size between a 32cm HAC and a 30cm Birkin, let me know. I would like to be of help if I can.