I signed up with NRMA for the Veteran, Vintage & Classic Vehicle Insurance package for an agreed value of $45K with limited use of 9000km per year for $552.
The agreed value was very easy to request, the consultant asked what I was after, i asked him for $45K (expecting to be knocked down to $35-40K) and he agreed after he said that the he looked up the average price on carsales.
He also listed limited wedding/formal use on the policy so if anyone approached me to do a drive I would be covered.
There is 'travellers care' which is similar to the roadside assistance when >100km from your home address.
MJ