Any of the Images would be good; my favorites are "cloches a travers les feuilles", "et la lune descend sur le temple qui fut" and "reflets dans l'eau"
Preludes; "le vent dans la plaine", "collines d'anacapri", "ce qu'a vu le vent d'ouest", "les fees sont d'exquises danseuses", and obviously "feux d'artifice"
Estampes; ALL OF THEM! PLAY THIS SET NOW
Etudes; not AS familiar with all of them, but I've worked on the Chromatic Study and had to play Arpeges Composes for a jury. Both were very exciting, but the arpeggio study is by far my favorite of the set
...generally, all of these sets have pieces at your level... maybe a few of the etudes might seem tricky, but if you are actually playing La Campanella, the difficulty would be more from his writing/harmonic style than from raw technical hurdles.