the rv version of the 40 is about 425-460 new and usually about that same price used with a peacekeeper muffler thrown into the deal

i think you will enjoy the H-9 very much

zdz 40 link:
http://www.rcshowcase.com/html/engines/zdz40.html

i orginally went with the satio 180 for ease of set-up only to realize the zdz 40 set up was just as guick plus i could run a smaller tank, ease of starting no glow ingitor needed, less tools to take to the field, ect.....