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Jason L1) Leon, nice problem to have, first of all! I still don't have a card of any of the 3...but that's my fault. I could probably cash in the collection and buy one 
2) I agree with PhilG and Peter...scarcity and asethetics will play a role.
3) BUT! pushing those larger issues aside, I think I would agree with your order, because Wagner has an incredible mystique about him due to his T206 and the fact that he is on fewer issues. ..because Cobb just has that bad-a** thing going which draws the imagination about his every image, and ...because Ruth is just so well-documented, there just seems to be other opportunities to get one of his cards or images.
this makes no sense, but at least I understand that.