Anne McCaffrey's Pern books are good (I got started in middle school, when a teacher of mine got us to read Dragonsong). I wouldn't personally recommend the new ones written with/by her son Todd. I read the first one or two, and it read pretty much like a plagiarism of the original stuff (it was the exact same story, same characters, everything, just retold a little)
The Ship That Searched (written with Mercedes Lackey) is still one of my favorite books (it's the second book, but IMO the first book, solo written by McCaffrey, was crap D:)