I won't pass judgement on Murakami and Vonnegut, whom I've unfortunately never read, but I have heard many good things, here and elsewhere.
Some of my favourite authors are Poe, Joyce, Borges, Proust, Kafka, Mann, Dostoevsky, Tolstoy, Camus, Lovecraft, Tolkien, Hemingway, Ibsen, Faulkner, and Márquez. I've heard excellent things about, but have never read, Samuel Becket, Don DeLillo (
Underworld), and Cormac McCarthy (
Blood Meridian -- compared favourably to
Moby-Dick by aesthetic prig Harold Bloom). Bloom has also highly praised fantasy author John Crowley, though, again, I have no first-hand knowledge of his works. Ursula Le Guin is another fantasy and science fiction author you may be interested in reading; her definitive work and the only one I have read is
The Dispossessed, a utopian anarchist novel. Umberto Eco (
The Name of the Rose and
Foucault's Pendulum) deserves mention, as does Nigerian author Chinua Achebe (
Things Fall Apart). That should suffice for now; I'll post more recommendations if they come to mind. You might consider browsing
WikiProject novels to discover new authors.