I had a sus seatpost for a while,eventually it gave alot of side to side play and the top threads stripped but for a while it was cool....not sure if it was cool enough to justify the cash I put out.
...on saddles;I found an ok one at Wallmart,just a simple cruiser seat with big springs made by Bell
that has served well for quite some time but after about 10 miles you feel it.
Remember those old huffy wanabee bmx bikes from the mid 70s? they had a bananna type seat made to look like a motorcycle,If I could find one in good shape I would be into giving it a shot,they were long with alot of padding.