RE: H9 Extra 330L engine
The BME Extreme is way too much power for my flying style. If I was going to hover that would be the only way to go.
I would really like to go with a twin, and have been intrigued by the Zenoah GT-80 and Brison/Fox 4.8. Based on the weight of the airframe I'm think I will need weight up front anyway.
A couple of guys in my club have the ZDZ 80 and absolutely love them. The only down side I've heard is (1) weight (2) Showcase's service isn't very good. However they are absolute studs in the power category.
Really the biggest challenge I have is getting a engine that can make my club's sound policy. I need to be under 101db average from 9' away from each wing tip and front and rear of the plane.