I know each $ counts, so here is a proven alternative to the JJ1800 to consider by Behotec, I have had three Behotecs 66s and the quality is first class German engineering. If you decide on this one you will have the assurance of ten years of production. For a few hundred dollars more you are purchasing a quality turbine kit, that has featured in the GTBA efficiency trials and been reviewd by leading and impartial turbine testers.
http://www.altecare.com/behotecturbinescdn.htm
Paul