Also the 3 etudes outside the main 2 sets are also good, and could be a good choice for an audition because not many people will be playing one of those three etudes.
she also suggested either the black key etude or the aeolian harp. im leaning towards the aeolian harp. it's beautiful, and the technique is consistent throughout.
You could look at Etude Op. 10 No. 3 - charming melody line and a good chance to show off your phrasing skills.
Op. 10 Nos. 3 or 6Op. 25 Nos. 1 or 5
These are both good, but are somewhat overplayed. If you audition a piece that everyone else plays, (and some of them play much better than you) you need to be innovative for it to actually mean anything to the adjudicators.
op.10 #6not too difficult