I Really like #19's "3D depth" with the shadow. Can you play a bit with the graphic and 1 or 2 versions of the font? I posted a comment earlier that our software provides for users to flow information from the top down, though 3 or 4 levels of users, ultimately ending up at the consumer level. Not sure how to relate this in a graphic though.
You are definitely on the right track with the shadow's though. Look forward to seeing more. Thanks so much!