I have a Saito 80 and am completely satisfied with it. I don't do 3D but the 80 has plenty of power and as far as weight is concerned i doubt it is significant altho I suspect the 72 will power the plane every bit as good as the 80..Those who think the 72 and 80 are not enough for this plane are assuming everyone is obsessed with power and fly as they do..
Everyone does not! If you like sport flying the 72 or 80 are fine..