I hope to get my Soma frameset soon and and am thinking about getting a Brooks saddle for it. They just have such an overwhelmingly large range of different saddles...

I use a Specialized Ruby 155 at the Moment on my MTB and like it... my sitbones measure 135 mm from center to center.
I'm just not sure which Brooks would be the right size for me. I will use the new bike for everyday biking and some touring. I'd like to get a "sporty comfortable" position on it, not too upright but not like on a racing bike either - I guess I will end up in a similar position as on my MTB.

I'm wondering if the B17 will be too wide because it says "175mm" width in the description? I guess the "B17 narrow" would be too narrow
The Team Pro (160mm) could be the right size for me too I guess.
Then there is a "S" version of each of those saddles too.

I'm not so sure if it's even sensible to judge roughly by the width of my Specialized Saddle which Brooks I should get?