If you can point me in the direction to anything that's even better than La Campanella, please go right ahead!
First, I must agree the La Campanella is an awesome piece and most pianists enjoy it a lot, especially if they're only a couple years into playing "Classical" music. It is definitely one of the best-received showpieces in the piano literature and is an excellent ending for most recitals (well, perhaps a "reserved" piece if an encore would seem appropriate). Still, while it is in the upper-echelon of showpieces, there are plenty of "better" pieces from a musical and--some will say--a technical standpoint. It is *almost* a stretch to even refer to this one as Liszt's own because the original La Campanella was composed by Niccolo Paganini as a violin concerto (if you haven't already, be sure to check it out!). Of course, the overall structure is quite different from the concerto so Liszt deserves credit from the technical side.
Anyway, I'm getting off topic. I thought I might try and give you a list of pieces that you might also like (it probably won't be that large seeing as I can never seem to come up with pieces at the top of my head...) and if I think it's appropriate, I'll put an asterick next to the title, which signifies that the piece is a showpiece similar to La Campanella. We'll see how that system works...
Liszt: Grand Galop Chromatique*
Paganini Etudes 1, 2, 4*, 5 (really beautiful), and 6* (the theme is more famous than Campanella--ever hear of Rachmaninoff's Paganini Rhapsody?)
Transcendental Etudes (won't list specifics. Just get the whole set and you'll enjoy them. Some are more showy than others and all represent some of the best musical ideas Liszt ever came up with)
Two Concert Etudes: Gnomenreigen*, Walderschaun (that's terribly misspelled, but you'll recognise it if you see it)
Funerailles
Two Legendes
Two Ballades (especially the famous 2nd one)
Totentanz*
Both Concerti (the first being *'d)
All Hungarian Rhapsodies, but in particular 2, 3, 6, 9, 10, 13, 15, 16, 19--most are *'d and are truly enjoyable pieces
Don Juan Fantasy*
William Tell Overture*
Valse Impromptu; Valse Oubilee (there are several of them, I think, but there are two popular pieces, one of each title, that you're likely to come across)
Mephisto Waltz*
Dante Sonata
Etc. (Liszt wrote some 1,300 pieces and transcriptions, but that should get you started)
I think you might also like Alkan--try his op. 39 etudes (All of them are superb, particularly in a Lisztian mindset), Trois Morceaux dans le Genre Pathetique, op. 35...well you'll get the idea.
And also the excellent selection of music from Chopin. Again, if you're looking for exciting "masculine" music you might try the Polonaises, Sonatas, Concerti, Variations, Allegro De Concert, Rondos, and Etudes (not as flashy as Liszt's or Alkan's but more concentrated and, some may argue, musical). You may also like Rachmaninoff, and his output speaks for itself (everyone knows of the concerti, sonatas, etude-tableaux, and preludes).
For the Liszt, my recommendation (and favourite pianist) is Cziffra (I know, I know, Cziffra fans are being boiled alive in oil these days...but what can I say)--his Chopin is also great, despite his limited work in Chopin's compositions (that is, he didn't record much of Chopin's music). There are plenty of others to choose for Liszt, though...for Alkan, Hamelin is the obvious "chosen" artist of the day, but don't overlook the masters like Smith, Lewenthal, and Latimer (to name a few) as well. Rachmaninoff, like Liszt and Chopin, has a huge following today, but one of the best "starter" CD packages out there is from Ashkenazy (it's not the best playing, but it includes a good deal of Rach's "big" pieces and is not too expensive).
The list continues from there. You'll want to branch out to "real" classical music (that is, music actually written in the "classical" age as opposed to romantic) eventually, for there you'll find some of the greatest *music* ever composed...Mozart, Haydn, Beethoven, Clementi, blah blah blah. Same thing goes for the Baroque, with Bach, Couperin, and Scarlatti being the most popular composers of the era.
I hope that helps a bit. One can't really compare all of those pieces to La Campanella, but perhaps that's not really the point.