Have you looked at the Beech G36? It can be ordered from the factory with FIKI TKS, can be turbonormalized (with gross weight increase to 4000lbs), tiptanks can be added. Its handling is one of the nicest, it's well built, can go to major airports maintaining 150 kts on the glide or it can slip into small grass strips.
It has a large cargo door, excellent visibility.
You could also pick up an older A36 and fit all these goodies.