My own (not including any of the Mary Stewart ones, because that wouldn't be fair to the rest of the books on my shelf) would have to be Lucilla Andrews' The First Year, which still gives me that same lovely feeling it did when I first read it years and years (and years) ago. I tend to pick it up at least once a year and read it over, just to fall in love with Rose and Jake all over again.
Anyhow, I wish I could have given all of you books, but I only had four, so the winners, selected at random from those who left comments, are:
Congratulations to you all. Please email me at susanna(underscore)kearsley(at)yahoo(dot)ca, and let me know where you'd like the books sent and what name you'd like me to sign them to.