Well, it depends. Do you have wide sit bones? If so, a B17 would be optimal. And if you don't care about the minimal increased weight, even better. I have a B17 on my old 80s frame and it looks nice. It's wider and longer than most other "road" saddles, but not nearly as big as a woman's cruiser saddle. And I would think B17 for touring is an excellent matchup. Just be sure to get proofide and a plastic bag to aid in the breaking in process and preserve it.

And I don't sit on the rivets... I think you'd have to adjust it if you were sitting on the rivets like that. Unless your butt is that wide.