Thanks for the responses :)
It's a 2001 and while the value is not too high, I will be taking a big hit on it in NZ if I sell it there (the pain of fuel prices is everwhere and the kiwis do love their 5.0L Holden Commodores and Ford Falcons! ), and will lose money as soon as I buy one here so, on balance, as I know the history and mainenance of mine, I think it may just have the edge.
Re the speedo, it has a kph needle counter, will the converter be enough, or do I need to get the acutal counter facia changed too? It is a big job?
Thanks again everyone! :)