I m in a similar boat now. I still have the original Selle Anatomica saddle that worked really well on 1000k + brevets. Earlier this year I purchased a new Selle Anatomica and undragged to carbon rails for weight saving in order to prepare for 23 PBP, Unfortunately after riding plastics saddles for a few years the leather saddle does not work for me any more, too soft and uncomfortable, even on shorter rides. I kept putting it on and off all summer long, eventually I realized that I prefer plastic saddles, even for long rides. I have been very impressed with the new borrowed Bontrager Aeolus short nose saddle(still testing). I have not ridden more than 200k on it though, longer spring brevets will show me if it is a keeper. So far I have not had any issues. I do agree with Carbofiberboy about pressure saddle sores, but would not know if the Aeolus saddle will cause it or not unless I ride at least a 300k of more next season.