I suggest anything by L.M. Davis, Justin Martin or Wendy Raven McNair.
Do a search in "members", they are all here.
Ditto on the Administrator's suggestions, all are really good writers with great stories. Also anything by Andre Norton. Come by my book website if you like, I keep adding books and I really try to put warnings on the book descriptions about language, sex, mature themes.
You're a busy person! It's all good.
I would be delighted if you'd share your recommendations with me too. Like I said, I'm always looking for more books that are age appropriate for my website. www.alienstarbooks.com.