I rode on a cheap Fuji saddle for like a year. Sucked so bad.
The stock one that comes with the concept is alright, but still hurts.
The turbo is awesome. But it might be a little too old because its starting to feel rough.
The Selle Italia Expedia is pretty sweet. Took it for a 30 mile ride the other day without bike shorts on, and it didn't hurt too bad.
I really want to try the Concord. I've heard bad and good things.