Jaspen, I bought the 2-pack (about $5) of the Heinz VitalFlow teats in '3' size which is the fast flow. They have several different styles, but I bought the one with the wide neck as I figured I'd need a wide neck to fit the Avent bottles properly. Most of the brands available in Woolies (home brand & well known brands like Avent, Pidgeon etc) looked like the neck of the teat would be too thin/narrow and it would leak when put in the Avent bottles.

There were some really fancy looking teats available in different shapes but were anywhere from $8 upwards, not something I was prepared to pay when there was a possibility that Maddy either wouldn't like them or they wouldn't fit. Either way, she seems happy with these.