Hm, although the Chopin Etudes are a bit above me right now, perhaps after I get a basic proficiency in my octaves [can play scales without mistakes, go through the hanon exercise 51 at a good speed with no mistakes] I could start playing with 25/10, just as a technical study for now.
Chopin: Nocturne No. 15 in Fm. Op. 55 no.1.