Meggie, you've been given some good advice so far - but the challenge comes in turning it into reality!
Peak Performance Buoyancy can be an amazing course, or it can be cr@p. To be honest, many recreational diving instructors wouldn't know "peak performance buoyancy" if it came up and bit them on the a$$. You definitely want to hunt around and find a good instructor - not just for this particular course but all PADI courses. As Lynne pointed out, if they are done to the minimums then you are being shortchanged.
Not sure exactly where you are in Sydney, but my suggestion would be to drop in to
Dive Centre Bondi - I only really know Liam (one of the owners), but I know how much emphasis he puts on having good instructors who not only have really good skills themselves but also know how to pass them on to others. You will learn heaps by any course that they offer. Drop in to the shop and have a chat with Liam or Robin and they will sort you out.
Enjoy your first winter of diving! Sydney has roughly the same water temperatures as we do, you can survive in a wetsuit.... but my view has always been "why bother to survive" when you can be toasty warm in a drysuit!
The courses I enjoy teaching the most are these: Wreck, Nitrox, PPB, Self-Reliant Diver and Advanced Wreck. The last two are "mine" and not standard PADI courses, they are both awesome in terms of giving people lots to learn. A blatant plug, but hey...!