I've heard good things about USAtoAUS, but I never realised they were based in Washington state. That could have saved us some money when we paid $900 to ship Dad's Arntz from Washington to California...
If you're looking for options on the east coast, I shipped a 40ft container from New York and was happy with
International Auto, Motorcycle, Boat, Container Shipping: Overseas Car Shipping : Marine Transport Logistics, Inc.
Marine Transport Logistics
63 New Hook Road
Bayonne, New Jersey 07002
Tel (201) 858-8600 Ext 106
Fax (201) 858-8607