^ So glad someone mentioned Catch 22, was beginning to wonder what was wrong with people.
I am a huge Stephen King fan, but his writing style is so unique and so obviously him in all his books that I would suggest maybe reading just one of his famous ones (The Stand is a good choice) - if you're looking for different narrative styles there's just no point in then going on to read, say, 'Salems Lot or Cujo.
Having said that, try The Long Walk, written under his pseudonym of Richard Bachman. Or heck, all the "Bachman Books" have different writing styles. Add to that "Dolores Claiborn" and that should round you up on the Stephen Kings.
Ben Elton is another with a very unique writing style so again I would suggest reading one of his. "Dead Famous" is probably the most famous. Having said that, although they're all written in a similar manner you should still read all the Eltons you can get your hands on because they're awesome.
I've recently been reading Tom Holt. "You Don't Have To Be Evil To Work Here, But It Helps" was the first one I read, loved it. Very tongue-in-cheek and it flows beautifully, despite large bits of made-up science!
All of that is modern fiction of course, so throw in Dr Faustus for some Elizabethan fun and then go right back to Women of Troy to see how the Greeks liked their stories. Actually Women of Troy is probably a bad idea, the Odyssey would be better.