Don't forget the Fantasia Op.49. All three are unique masterpieces in their genre (the Fantasia is all but a Fantasy, I actually couldn't find more solidly organized music than that). Monica, I don't believe it's really important what you play, I mean, the Bolero is a known piece but seldom performed in concert (this is probably a plus in a competition, since you won't bore public and jury with the umpteenth Polonaise héroïque), if you like playing it and play it well, then do not think twice about that and put the Bolero in your program. My only suggestion about the competition is: choose pieces you have already learnt in the past and be sure to have enough time to polish them up focusing on the fine details. Plan your schedule carefully.