Skylane81E
Final Approach
SMA is the French diesel. I heard it was $44k for a firewall-forward replacement back when it was only introduced (STC-ed).
I think it's gone up quite a bit now. But you have to remember you are getting an engine, a prop, a mount, a cowling, FADEC and all the other little gizmos that go along.
I had a chat with them at OSH one year, IIRC they said that decent power was 60"