i don't agree on mendelssohn g major or saint-saens 2,5 or ravel g major- they're actually overplayed here. i agree on khatchaturian - i've been trying to play it for about three years, but it's awfully difficult for orchestras.
i add on your list khatchaturian the rhapsody for piano and orchestra, ireland, dvorak, prokofiev 2nd and 4th (especially 4th - what knid of a left hand do you need for that???) and lipatti concertino.