You will pay GST on the value of the car and shipping, import duty @ 5%, stamp duty on the cars value to register it at 0.3% ish, vehicle inspection fees at $300. This is without all the mods you will have to make to allow it to be driven here including rear child restraint mounts (irrespective of whether you have kids or not). Also I still believe you have to have owned the car for 12 months even under the pre 1989 scheme. Minis were not made in your body shape at all (all have external hinges here) so body parts if you have any kind of accident here will have to be shipped from the UK. This is coming from someone who has shipped two cars here already. See here http://www.pomsinadelaide.com/forum/...ng-cars-2.html
As an old Mini owner I couldn't think of a worse car to bring for everyday use! Costwise you are looking at double your shipping figure of £1450 - possibly more. What is your current car?