A short sample of authors I've really loved
Catherine Asaro - (I love the Skolian Empire series and I never see any of her books in the stores)
Lois McMaster Bujold - (I'm addicted to the Miles books)
Diane Duane - (Young Wizard series)
Ursula K LeGuin
Robert L Forward - (Absolutely loved Dragon's Egg and Starquake)
C.S. Friedman - This Alien Shore is one of my fav books out there :)
A few items I really don't like
Romance/Relationships - with the exception of Asaro, the subject usually bores me to death
Urban Fantasy - I just haven't been able to get into the dark, dangerous, sensitive guys, the tough and dangerous women, fights, drug use, little substance, etc. Examples of this are Caitlin Kiernan, Twilight books, Anita Blake, etc. Basic rule, if it has vampires and/or werewolves in it I will probably dislike it. (Not that I dislike vampires specifically, just most of the books written about them. I did enjoy many of Anne Rice's books.)
If it was published or the series was started more than 5 years ago, I have very likely either read it or it has fallen into my don't like list.
Anyway, any suggestions would be greatly appreciated.