Just to let you know where I am going with this question: I'm still riding the WTB Speed, which has become sort-of bearable for a while by lowering the nose and moving it forward a little. It does become painful after about 75-90 min, which is how long I tend to ride.

After studying what I know I like and what others recommend, I ordered a Selle Italia Diva Gel Flow at a place where the price was ok, and it's now winging its way to Alaska. I'll post once I have experience with that one.