Well, if you want great authors, you gotta get any SW book by Michael Stackpole, including the
Rogue Squadron books. He really has the characters down well. There aren't many appearances by Luke, Han, et al, but Wedge Antilles really comes into his own as a leader and Corran Horn is an awesome NEW character. Stackpole also wrote
I, Jedi from Corran's point of view and it's a great one.
Now, as far as must reads go, I highly recommend Timothy Zahn's
Heir to the Empire trilogy. He introduces what become really KEY characters later on in the Expanded Universe, like Talon Karrd and Mara Jade as well as the Noghri people. Really entertaining stuff... just read right on past the overused SW cliches. (One "I have a really bad feeling about this" per book is more than enough.) They kind of hung me up the first time I read them.
As for later on in the timeline, I also recommend Kevin Anderson's
Jedi Academy trilogy (so you can see what's been "happening" in Luke's life, and in the lives of the "new jedi") as well as the entire
New Jedi Order series. This last series is now 13 books strong, been told by several different authors and is a real emotional roller-coaster! There are some nearly unbelievable things happening in this series, and it's still going strong, so you might want to jump in there. Some authors do a better job than others, but you really gotta read them all to have a clear picture of what's happening.
The early Han Solo trilogy (and by early, I don't mean "written a long time ago", but rather "concerning Han's early life") was highly entertaining, too. It was written by A. C. Crispin. They're called
The Paradise Snare,
The Hutt Gambit, and
Rebel Dawn.
The two-shot
Specter of the Past and
Vision of the Future were also written by Timothy Zahn and it seems he has a MUCH better grasp of the characters in them, too. I liked them a lot better than his first three.
Got enough books recommended to you yet? I'm sure others will recommend some of the
dozens of other books taking place in the SW universe. Ain't fiction grand?