I also really enjoyed the first two of the Outlander series, but I never got around to the rest.
Historical fiction is my favorite genre.
My go-to books for fun is the Master & Commander series by Patrick O'Brian. My father told me about them years ago and I've read the entire series a couple of time now. They are just fantastic - you just fall right in and sail along with the story (so to speak).
For Christmas I asked for Wolf Hall by Hilary Mantel about the Henry VII & Anne Boleyn saga as told by Thomas Cromwell, but I'm having a hard time getting into it, maybe because I read it in bed and start to drift off after about 10 minutes so I forget most of what I read from the night before!