It's a bit hard to compare. Some of the things that make it hard are :

Agreed value/market value
Variable excesses (pay less annual fee for a larger excess
No claim bonus/member discounts
Multi policy discounts
Street address (some addresses/suburbs are more expensive to insure than others) .
And age of driver

I've used aami because they do agreed value. But the max agreed value of series 1 is getting too low. Especially if you bought a 4.2 - the price you paid would be higher than agreed value.

And then you buy a vehicle for 4x the purchase price... And insurance is only $400 extra.

Robbery.