I love to play Chopin. Particularly the Nocturnes. My favorite Nocturnes that I have played are Op. 72/1, Op. 9/2, Op. 55/2. I also enjoy playing Beethoven's sonatas, though they are quite challenging. I have played Sonata No. 7 in D Major. Right now I am working on Sonata No. 5 in C minor.
There are so many pieces for the piano that I would love to eventually play. So in the long term (after college and such) I hope to master quite a few challenging pieces. I would love to someday play Liszt's Liebestraume No. 3 in A flat. I would also love to play Chopin's Ballade No. 1 in G minor (this is probably my favorite piece of music ever). I would also love to play Beethoven's Sonatas No. 29 - 32.
If I say that I have mastered those by the time I day, I think I can say I would be pretty satisfied with my life.
PS feel free to PM if you want anymore suggestions or need some help finding stuff because I have a pretty extensive classical music library