All these lights are quite small - no more than 8-9 meters of elevation. But in the gateway to harbour there are 2 more "advanced" lights. First is Hornby (South Head Lower) Lighthouse, oldest in the area (1858):
And MacQuarie (South Head Upper) Lighthouse (highest and most powerful - range is 25 nm), constructed 1883:
Additionally in Sydney you could find 2 lights in National Australian Maritime museum (Darling Harbour).
First is Cape Bowling Lighthouse (1874, rellocated here in 1987):
And Lightship CLS-4 (Carpentaria) - she served from 1917 to 1987 in the Queensland:
And the last one very unisial:
Yes, you're right this is water tower. But additionaly it is included to the Admiralty list of lights as K2653 (red and white light, occulting every 3 seconds) :)