i'm going through my own spanish lit class. reading all the greats: Vargas Llosa, Bolaños, Benedetti, Asturias, Octavio Paz, Borges, carlos fuentes, Cortázar and imo no one beats Gabriel García Marquez.
and his magnum opus: Cien Años de Soledad
that's the one book i can read again and again (in spanish)
his style, his diction, his imagination, no one comes close.
and there are imitators, (add me to the list

)
he is a true master. a genius. his other works are true gems as well
Chronicle of Death foretold
Love in a Time of Cholera
The General and His Labyrinth
Of Love and Other Demons.
his short stories..i could go on
but if could take just one book with me to the grave, to read throughout the eternity of the afterlife, that would be Cien Años de Soledad.