I use to run a Red Baron seat foam, was a nice shape and softer than my friends BBR!
How tall are you? Im 6'4" and i end up sitting right at the back of the seat it dont really matter how soft if your tall as theres not my padding there!
All of the ones posted are good and comfortable to that person who posted. I'm curious of the tall seats that others SHOULD stay away from to avoid monkey butt or a slippery seat.