The most similar composer to Paganini (that is assuming you meant to imply you wanted music like his) is probably Chopin. Both romantic era virtuosos showcasing individual instrument prowess that has rarely been matched.
In general, for my money Debussy is the most 'consistent' 'classical' composer, La Mer, Nocturnes, Claire De Lune, Prelude to the Afternoon of a Fawn, and many more all excellent works that teach one to have an ear for more than just blatant melody, but texture and impressionism as well