I'd put Desharnais on the wing. Gomez is better than DD defensively and on faceoffs. Seems like a no-brainer. Of course, Eller has shown he can be a pretty good winger, too.
I do generally agree with CC that our best 3 centres are still Plekanec, Gomez, and Eller. I also agree with him that of the two younger guys, Eller is the guy I think can replace Gomez. But I do think Desharnais is a NHL player, I'm convinced at this point. I'm not sure if he can't be more effective on the wing, though, where his faceoffs and defensive misgivings can be sheltered more. I guess until Leblanc (assuming we develop him as a C) is ready Desharnais is our best option... if we decide to move on from Gomez, which wouldn't be until season's end, anyways.