I plan on learning all the Chopin Etudes eventually... probably as I go through college and work on my Music Degree. As far as the two that sound most fun... The ocean etude, which you are considering, is one of my favorites. I'm thinking about learning this for the study in arpeggios. Other than that one, there's always my favorite Op. 25 No. 11. Despite what people may think (not everyone's opinion, just what some have told me), I consider it both technically rewarding, as well as musically, and it's always an impressive piece to play.