R.A. Salvatore's series are definitely good and goes along with that classic high fantasy idea and has two really good trilogy's that I've read which both happen to contain Drizzt, but Ender's Game is a science fiction novel written by Orson Scott Card. The Ender series is good, so is his Earthfall series, that's a set of 5 books that'll take you a while to read, definitely some nice Sci-fi in there.
Another Sci-fi author that has got a lot of books out is Ann McCaffrey's Dragonrider series, though those don't really follow one character as much as a lot of them throughout the history of this world she's created.
Terry Goodkind's series is called the Sword of Truth series, and he's finishing it up by writing the last book of it too. I'm not sure, but it's probably number 11 or 12. I read him a lot like I read Robert Jordon, which is to say how MusicScribbles described it. He's basically made the end a trilogy of books, that are leading up to a big ass finish.