C13,
I have spoken to Jabiru a little while back and recommended a parts manufacturer as my neighbour works at that Company and they manufacture to a very high standard - to a variety of Industries requiring exacting standards. It seems when Jabiru decided to go with a new type of bearing rocker arms, they ended up with unintended Torsional Vibrations, which did cause some problems. A good friend and Mechanical Engineer has good words for the 6 cylinder Jabiru, as he has one. It would be hard to beat on Price because of the Exchange Rate, as well as weight. It's reliability and longevity I can't speak for, as I have no experience with the engine itself.
Hope that helps.
George