I am building a Zen 50 and I am trying to decide on an engine. I have an MDS 58, OS 61FX, Saito 91, YS 45. I am leaning towards the MDS58 because it weighs less than the OS61 and should not produce that much less power. I am hoping for the plane to have unlimited vertical, but I do not want to have problems with balance.

Any suggestions. I am not opposed to buying another engine.

Thanks