I agree with the liszt transcendentale Etude No. 1, thats a great piece to play to get attention. How about the 10th, or maybe the 8th, they are amazing, but perhaps a bit lengthy. I think flight of the bumblebee, arranged by Rachmaninoff is good, it is "short and sweet". The Chopin op. 10 no.4 maybe. Well thats my suggestions I agree with all your choices.
How bout' La Campanella and Heroic Polonaise?Shag
Wow, everything under Op. 39 for Alkan is insane. Probably out does the entire list so far.
I have never heard of the name Alkan.... Who is he? where is he from? when is he from? anywhere I can see some of his music?
What's a showy piece you can play in 5 minutes or so? Just one piece if you can pick from all of the music in the world...