Which Saddle?

Just had my bum measured at the Specialized store in Covent Garden (sitbones 120mm apart) and the guy in the shop suggested I get a 155 Romin as I tend to ride fairly upright. That's wider than any of the Selle saddles available, so what width would I need if I wanted to try Selle?

It's not always the width that important, as it's the shape of the saddle that is.

The saddle width measurement is an easy way to narrow down the saddle choice, but ultimately it down to how you find it, just buy one, try it a couple weeks and return it if you can't get comfortable (taking advantage of their return policy).