be aware that the b17 comes in two widths. Using the specialized butt width measuring thing, we picked a Toupe in a 143 width. On my touring bike, I wanted a B17, and on my first tour I found that the standard width brooks felt too wide for me. The edges of the seat felt sharp. On my latest touring bike I went with the Brooks B17N (narrow) and really like this.
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2009 Custom TI Frame Road Bike, all 2007 Campy Record, Campy Euros Wheelset
2009 Custom TI Frame touring Bike. S&S couplers, XTR Drivetrain. LOW granny.
2009 Performance Bicycles TI (by Lynsky) road frame, 7900 DA, 7950 DA Compact Crank, Light Niobium Rim Wheels