I believe the threads below may help to clear your question a bit:
(1) http://pub44.bravenet.com/forum/3728984891/show/631960
(2) http://pub44.bravenet.com/forum/3728984891/show/646646
(3) http://pub44.bravenet.com/forum/3728984891/show/748081
We had a brief discussion in such issue before.
Beside, if you want to have a sea-water boat from a used fresh-water boat, simply swap all the installed zinc and the thermostat to the salt-water type and you may free to go!
There is one more option if you are talking about sail boat. You can hire someone to sail it back to HK. I am told it cost HKD100,000 to bring a boat back to HK from Australia. It may make sense given the financial crisis is hitting US/Austalia hard, and A$ has weakened a lot...
Oh really? Interested to know more. Do you mean the boat may got damaged on the way to HK??? or the crew asked for a higher fee than that agreed??
The options is attractive not only because of the price but also the choice.