With the saddle, I've found that there are broadly two basic types I need to be aware of when buying for me.
Ones which have a flat-ish surface, like a Specialized Toupe. Others which have a broadly rounded upper surface, like a Flite, that will bring the saddle closer to your, erm, delicate bits.
I don't know if all the science/marketing blurb holds true, but I've certainly found I avoid any numbness by going for the former style i.e. flat-topped saddles. For me they keep the pressure on my sit-bones, rather than areas where the blood supply travels.
