Go with the DP Ultimate hands down. I do own the H9 Edge but the DP Ultimate is far more stable in harrier and elevator than the H9 edge. Before you go buy the Satio 180 give the new YS 1.40 Sport a look. Its price is pretty compareable to the Satio 180. Either of these engines will be more than enough power for this plane doing 3D or IMAC. The YS would be alittle more consistance due to the pressure system though.