120mm! Yup, you get plenty to choose from in the saddle world!

Me and my honkin' 170-180mm sitz are joyful members of the Brooks cult. I used to love the Terry Sport (not made anymore) which was nearly wide enough and didn't have a cut-out and wasn't too padded. Now I've got a Brooks B67 which *is* wide enough, doesn't have a cut-out, and has no padding.... ah, bliss.

When you do find your blissful saddle (and you will, have faith!) buy two.