Heck, my butt's been planted on a Selle San Marco Rolls for the last 14 years. This thing has to be a full pound.
http://www.amazon.com/Selle-San-Marc.../dp/B000NOO5T0
I got sick of trying seats out and checked out what the riders int he TDF were using, and in 1998 it was that. It's a stupid way to pick a saddle but it works for me.