Saddles (or bicycle seats for the novices) are a very personal choice. It seems to vary with each rider/user. I seem to settle after a time with the Nirve or Electra Beach Cruiser ones that are a bit wider in the back:

http://www.nirve.com/cruiser-bike-ac...s.asp?cid=3004

http://store.electrabike.com/eSource...ts.aspx?store=

or similar ones out there. My own Brompton has the Nirve one. My restored Raleigh Twenty uses the Electra one. My my latest vintage bike uses the original saddle it came with (and probably was on it when the bike was new).

Photos below: