Which composers do you like besides the ones you've already mentioned?
I don't see any Baroque or contemporary. How about some Bach or Prokofiev.
Gnomenreigenisnt all that hard. I bet you could do it. I never learned it all the way through because it wasnt a piece i was working on. Its really not that hard. Once you get used to it.I would also suggest baroque, start with an easier prelude and fugue and then work from there.I would say learning another chopin etude would be fun for you, but only after you learn a prelude and fugue. Or a mozart sonata