RE: Good .40-.50 engine
How many guys do you know who have only one engine? What you might use it for next isn't the best criterion for what you need it for now.
As to the .36 being outside the requested range, and as long as we're being silly, what did you think about the .52? It's not really the point, is it. The point seemed to be a suitable engine for the plane. Silly me.
Jim