How about Tarantelle uber "La Muette de Portici" from Auber? It's a strangely flawed work, BUT I think that a virtuoso (look no further than Cziffra, for this piece) can do wonders with the work. Or how about the waltz paraphrase from Gounod's "Faust"? A tremendous piece! Along the same lines you might consider the "Concert Waltz on Two Themes from Lucia and Parisina" (Donizetti) and the shockingly overlooked "Reminisces de Robert le Diable" from Meyerbeer's opera...one of those aggressively macabre pieces...for something a little more mainstream, maybe you could look into the "William Tell Overture" transcription, or "Reminisces of Norma," neither of which is TOO difficult (that is to say, not as difficult as Don Juan).
For original compositions, try one of the Polonaises--I like the c minor one the best, but the one in E major is growing on me--one of the Ballades (both are excellent), one or both of the legends, one or all of the final three transcendental etudes, Les Jeux d'Eau a la Villa d'Este, or one of the HR's like: 1, 4, 6, 7, 9, 10, 11, 12, 17 or 19--or a mixture.
And don't forget either about the waltzes or the Schubert song transcriptions. I just heard "Hark, Hark the Lark" for the first time on Saturday and actually thought it was pretty charming and funny but with some good technical displays.