you left out lakeside.
I've only driven on Symmons and Bakerville. I like them both for different reasons, Symmons is all about bravery under brakes, and carrying high speed through the sweepers. Baskerville is a technical track on a rubbish surface. I need to get down to Baskerville more, but there arn't as many events down there, and Symmons is only a 30min drive for me too. So Baskerville would be my favorite that i've driven on.
I'd like to go and have a run on Phillip Island, and of corse Bathurst.... but Bathurst would be 10k+ after entry fee's, and transport up there.