You could always look into Sergei Lyapunov, Prokofiev, Rachmaninoff, Bartok, Mendelssohn, but my question is at this point in your piano studies - why bother? Almost all of the etudes and material by these composers are just as difficult as Chopin anyway.
I don't blame you for not wanting to study Czerny anymore. The reality is that, for you, it is wisest to either stay with Czerny for another year or so, or to stiffen that upper lip and move on to Chopin. Only you or your piano teacher can decide which option is best for you and will benefit you the most.
Chopin wrote the etudes over a span of 7 years from age 19-26. The Chopin etudes exhaust nearly every physical possibility at the keyboard. In terms of music history, they are some of the most significant pieces of piano literature - they deviated from the "old school" rules of no thumbs on black keys, no true leaps beyond a 6th, etc - Franz Liszt (an innovator of piano technique himself') was astounded with the possibilities that Chopin opened up for the piano.
These etudes, they are meant, all of them, to be studied by pianists over a whole lifetime (essentially). You will be doing yourself a favor to start studying them now, just don't speed up to proper tempo until you've fully familiarized yourself with the notes, the proper technique required to play the piece without injury, and the dynamics/intentions of the particular piece. Slow and steady wins the race with Chopin etudes. Study plenty of etudes at the same time and don't waste too much time repeating sections over and over!!! It is pointless to go over and over the same section in the same day, your body and mind need time to assimilate everything you have learned that day. So - give just a couple minutes each day to work on individual difficult etude passages and you will be surprised at how well you learn it and how fast it comes together.
The most substantial and important etudes for piano technique are Op 10 No 1 and Op 10 No 2. The others are very important, but the first 2 are revolutionary, historically, in their ideas of proper use of the thumb, proper hand position for playing, Chopin's emphasis on pre-planned fingering, and finger independence. Granted these etudes mainly focus on the right hand (the left hand is still important in these works!!) - nobody said you couldn't invert the studies. (There's always Godowsky's versions if Chopin's ever become too easy for you.. Hamelin enjoyed those quite a bit evidently lol)