thanks for the replies, lots of good advice.
about 6 years ago I brought over a Honda Accord under the Personal Import Scheme (older model) and that was pretty hard to sell - people weren't interested. I owned it for 3 years and sold it for 1K less than the total purchase+import price, so that was a good deal. So I guess I will need to think carefully about which model to bring.
The NSX is a sexy car and seems pretty rare here - only 7 for sale on drive.com.au. If I bring out such an expensive car, I hope I can sell it! What's the market like here for such an expensive import?