Selle SMP has a full line-up of basically the same saddle in different sizes. So the Pro model is 148mm wide, but they the other models are essentially the same saddle at a different width.
From widest to narrowest (Evolution -> Carbon are all 129mm width, with other differences)
Plus
Avant
Pro
Lite 209
Glider
Stratos
Evolution
Composit
Carbon
I went from the Avatar 143 to the Evolution but I did need a narrower saddle....and I would perhaps be quite comfortable on the Stratos or Glider too. I haven't had a chance to try them.
-Jeremy