What do you guys think on Chopin's Op. 44 Polonaise ?
I have had a bad experience with that piece

Anyways, here is IMO what you should play:
1.BACH!!!!!!
Bach has a lot of great stuff out there. Personally, I don't really find his WTC too interesting. They don't grab me like his other stuff do. English Suites, Partitas, or Toccatas are great pieces to play. I would personally start off with the 2nd English Suite in a minor BWV 807 and then play some Partitas and Toccatas and then finish off with the 6th English Suite.
2.Sonatas
Beethoven: Beethoven wrote some very beautiful sonatas. If you haven't played him yet, you should probably start with the Op.49 ones. Then go one to Op.14. After that, you can really try any one of the first 18 ones. My personal favorite ones are:
Op.2/3 ,10/1,10/2,10/3, 7(though it is hard), 27/1, 28, op.31/3(kind of difficult too)
Mozart: All of them are approachable(except for K.576,310,533). Though k.332 is really nice, I prefer K.284 in D Major( it is not as difficult as people say it is) and k.333( I found it very difficult, but most people disagree).
Haydn: b minor Hob.XVI:32 is a safe way to go. So is Hob.XVI 36. However, my favorites are the last 2 e flat major ones(Hob.XVI 49, Hob.XVI 52).
3.Etudes
If you can handle Op.10/12, you can probably do Rach 33/2 in C Major, a beautiful work. The 2nd etude could be something like Liszt's Op.1 no4, in contrast to the Rachmaninoff.
4.Impressionist
Debussy: Suite Bergamasque is a great choice for your level and a transition to Estampes, harder Preludes, Pour le Piano, etc. All 4 movements are really beautiful and exciting, especially no.4 Passepied. If you want to do a Prelude, you should probably stick to Footsteps in the Snow(my favorite in Book 1), Dance of Delphi, or Bruyeres. The Hills of Anacapri is a very advanced piece IMO and I found it to be just as difficult as the thirds prelude.
Ravel: Sonatine is very beautiful and you can do a very good job on it. Valses Nobles et Sentimentales would be my second pick, as it isn't too difficult but is pretty nice. My last recommendation would be Prelude from Le Tombeau de Couperin. It is a fun piece but it is pretty hard.
5. I know you didn't ask for this, but you should probably play something romantic. I have 2 suggestions, the Waltz in A flat Major Op.42 by Chopin and the Arabesque in C Major Op.18 by Schumann. And F sharp minor Polonaise is VERY DIFFICULT. It requires an amazing amount of stamina and I am having an easier time playing Scherzo nos.1,2, and even 4. You should probably play other Polonaises first, like Op.26 and 40. I would also play Op.53 first. IMO, it is a lot more straightforward than Op.44. Op.44 is also really awkward to play. No to mention that you have memorize 18 pages of music( the mazurka is hard to memorize).
In conclusion, here are my recommendations:
1.You should do some Bach like English Suite no.2 or french suite no.5.
2.Sonata: Beethoven, Mozart K.333,284, Haydn Hob.XVI 32, 26,49,52
3.Etudes: Rach 33/2, Liszt Op.1/4
5.Debussy Suite Bergamasque, Easier preludes, Ravel Sontine, Valses Nobles et Sentimentales
4. A romantic work like chopin waltz op.42 and schumann arabeske, NOT CHOPIN OP.44