Have you rode a fizik saddle before? If so, try their new versus range that has a central channel to reduce pain on your danglies.
Use the spine concept to decide if you're a Arione, Antares or Aliante type. I'm liking the look of the Arione as have narrow sit bones but on long rides get numbness from a Arione CX.
Awesome link. I'm not getting on with the planet-x I bought (30 minutes on the trainer, numbness begins). I may try an Antares next.