How is 39-12, Le Festin D'Esope?
Insanely difficult.
Seconded (but great fun).
I think the last movement of the Symphonie is even harder, however.
Op 39 no 11, Ouverture, is a decent suggestion. It's not especially difficult in comparison to some of the others. Op 39 no 2, En rhythme molossique is also not too demanding. I have a soft spot for op 35 no 6 and didn't find it too difficult, but I have quite large hands which probably helps.
Oh, and Ringeissen's Alkan is lame for a professional pianist.