Really, the whole "overplayed" thing just bugs me. Who cares if it's overplayed? Chances are that there is a good reason that they are overplayed. For the final round, do you have to do a concerto?
If so: I suggest Chopin's First, Second, Liszt's Second, Third, Prokofiev's Second, Third, or any Beethoven.
If not: Liszt's B-Minor Sonata.