I have a straight XR6 but this may be of use. After getting quotes from over 5 different insurance companies as well as doing the same for other vehicles ie Mazda Tribute, I found CommInsure the best. In fact, cheaper on average by $200 per year. CommInsure use Allianz for their vehicles.
You can locate a phone number via www.comminsure.com.au
They provide online quotes, but I found this to only be a guide as the phone quote was better.