How about a Suntour Superbe Pro. cheaper, longer, njs-er.
echo'ing above really, but the Dura Easton non/NJS really are a bit sketchy. I've had a couple that have had movement. In theory you could add extra bonding internally for peace of mind, but ain't nobody gat time..and somehow despite the design flaw, they are still generally expensive. look nice i guess.
The DA 7400 fluted is a lovely thing, totally solid, but short. then you'd have to have the matching stem
thomson works always and for any saddle rail and will never slip.