I'd recommend you give the following a call after Just Car and Shannons.
Allianz, NRMA, Suncorp.
They are completely independant (Just car and Shannons are owned by Suncorp but all have different underwriters) of each other and have fluctuations of when they will take on more grey imports. I call them regularly to see if the price I have is crap, hell just after Brisbane floods my premiums on my car went down by $120 and I live in the inner north side. Probably helps that my street etc is not a flood zone though =P