Interesting topic.
You should also include preludes/fugues and String Quartets I think.
Rachmaninoff- Etudes-Tableaux Op. 39 (Ashkenazy)
Rachmaninoff- Piano Sonata No. 2 (Horowitz)
Mahler- Symphony No. 9 (Bruno Walter)
Schumann or Grieg concerto, too hard to decide. Both may be considered the greatest piano concerti ever written.
Kidding

Rachmaninoff- Piano Concerto Op. 30 No. 3 (Lazar Berman or Olga Kern)
Chopin- Preludes Op. 28 (Sokolov)
Shostakovich- String Quartet No. 8
Medtner- Fairy Tales