Hi there.
Since I didn't know how good you're playing, here some of my favourite pieces:
Chopin: Scherzo Nr. 1 and Ballad Nr. 1
Maybe one of the Bach Toccatas?
Granados: One of the Goyescas
Ravel: Toccata from Le tombeau de Couperin
I could list a whole lot of pieces here, but these are, besides the Ravel, rarely played pieces. Especially Granados or the Chopin Scherzi are examples of really great, technically challenging and lyrical piano music which will always impress the audience.