i will go with my first thought although and that it Pern. I just love to fly a dragon.
I loved that series.. good stuff!
Since you know Mccaffrey, might I introduce you to Robin Hobb.. i recommend the Farseer trilogy.. and the other 6+ books that involve that world.. just finished one today, as a matter of fact. http://en.wikipedia.org/wiki/Robin_Hobb