I was kind of in the middle of saddle measurements with the Specialized thing too, and I found the 155 works best for me. I had the Jett, and I've moved to the Ruby. The 143 technically fit, but I wound up putting too much pressure on the pubis...the wrong part of the pelvis. See if they'll let you sit on some in the store at least if not do a trial.

I've also heard bad things about Bontrager saddles.