Hi David:
Your approach to choosing what'll work best sedems very logical and systematic. That's great. I think that when I'm writing for planning purposes, I follow something similar.
On the other hand, I've stumbled on to wonderful lessons, topics, methods, and uses for media resources literally by accident. Sometimes being open to students suggestions can be quite helpful.
Example, years ago while trying to describe a lower lobe pneumonia on a chest x-ray, some of the students in the class couldn't see what I was trying to identify. A suggestion came from a student to project the x-ray image on the white board using an overhead projector. Duh... it really worked. So I was able to draw an outline of the whole chest with pertinent contents including the area with the pneumonia. First with the overhead, on, then off, then back on, and finally back on the illuminator. Boy, there were a lot of "aha's" with that one.
Regards, Barry