Cheers for all the replies... I've looked into the issues such as import costs and so forth but it was just the pure transport cost I was wondering about. I'll track down that CH issue (probably unread in my mail at home - I'm OS at the moment) and check it out - thanks for the tip Jim.
Does anyone know someone who has done this? I'm not committed to buying a Nth Hemisphere boat, but its just nice to cover all the bases. There are still plenty of good boats to be had down-under, especially NZ it seems.