You forgot the 1835 version of the Paganinis. Version 2 of #4 from that set is probably the hardest of all of Liszt etudes.
Dover has a wonderful two-volume set of Liszt's complete etudes editted by Busoni for the Liszt Society. The second volume has both versions of the Paganini studies and the concert etudes as well. Definitely worth buying! Not expensive at all..Also, Gnomenreigen would be a great piece to learn, so be sure not to overlook it. It's reasonably popular amongst pianists, I know, but it's not overdone like Campanella, and it's undeniably cool. Also, it would do a fair amount to increase confidence in fast runs.
does anybody have a pdf for un sospiro?