I agree with Brahms Intermezzo op.118/2, you can also play one of the Chopin's Nocturnes-op.9/2 or op.27/2 or c sharp minor op.posth or Chopin's Etude op.10/3; Liszt Liebestraume no.3; Schumann's Arabesque op.18 or Das Abens from his Fantasiestucke op.12/1.