Hi Dawson
I got my Landcruiser 4x4 shipped from Scotland to Perth recently. I have seen lots of BMWs here and they are expensive. I've checked and the import cars do sell, esp when they are good ones. I don't see any problems with your BMWs to be sold here. You plan to bring One car over here only. I'd suggest you get both cars in here (provided it's in the two of you's name separately). They are very expensive here and X5 is the car for Perth- you'll enjoy it, even if it is little old........
All the best