I would like to suggest including "once upon more beautiful days: In memory of my parents" by David Popper for Cello solo, "Vocalise" by Rachmaninoff for cello and piano, "Elegy" by Faure for Cello and piano, and something with a cello part for Piano Concerto #2 In C minor, Op. 18- 1. Moderato by Sergi Rachmaninoff. I think they would make wonderful additions for all the cellists.