BFlood said..
I sail with a 4/3 in Tassie in winter so 3/2 should be fine in NSW
Quiksilver stores are selling last year's suits at 50% at the moment FYI
Good call on the Quicksilver sale. There is also a online sale (30% off) I have discovered until the 4th (I think) with the code "THANKYOU" for anyone else interested.
It sounds like a good 3-2 will work fine and anything more will keep you a bit more toasty.