I also think the c minor prelude and fugue is pretty popular, so if you have another one prepared I'd go with the other one. Chopin etude 25/2 is considered as one of the easiest etudes by Chopin, so if you're applying to a very competitive school then it could be that this might be a bit to easy in comparison to others (In that case maybe try op10 no. 1,2,4,8 or op 25 no.6,10,11,12, those should be fine I think (if you can play them!If they're too difficult then don't do one of those)). I don't really know the Debussy piece and Beethoven very well, so I won't really comment on those. But if you need a impressionistic piece then I think something like Ravel's Miroirs or Jeux d'eau (that might be overplayed though) or Debussy's images or the l'isle joyeuse might work.