Easiest Chopin Etude?

I play piano around a grade 7 and I'm interested in learning a Chopin Etude, but a lot of them if not all of them are very difficult. Which one would be the best one to learn? I've played some of his preludes which are not too bad so I have some experience with Chopin. I like his op 25 no 4. Any other suggestions. I would like one that's not like overplayed or popular like "Revolutionary" or "Winter wind", something less well known.