Have to say that I run a DA-50 on a Midwest Extra and it seems like a great combo. Since the Cap and Extra are the same size I would say go with the DA-50. Just my experience. I used to fly the MW Extra with a G45 which weighed a pound more than the DA-50 and did not have much zip to it. I cannot comment on the other engines but the DA-50 is a great machine.

Bill