Can't offer any suggestions on sprung seat, only that I'm looking into the Thudbuster ST seatpost in which to mount my Specialized Alias saddle which is very good for me, as a long distance cyclist and labourer(about 73kg's). I've discovered a SNAB or 'Sensitive New Age Back' after being rear ended by a car. The cause the demise of my last bike (Hence my purchase of a Thorn - Catalyst).
I'm interested knowing whether the Thudbuster ST will eat up enough small bumps and road roughage that the steel frame doesn't reduce, and help keep the back healthy. So if I can hook into this topic, maybe someone can type in some helpful thoughts if they have had some experience with thudbusters or other suspension seatposts with a similar intention in mind.
And in case some one comes up with suggestion, I'm not going to be riding a recumbant. I'd be dead if I was on one when I got hit, despite my appreciation of their relative advantages.
Cheers and nice to be alive and riding a Thorn.