genkicolleen: I played the original Ys Book 1 & 2 over and over again on TurboGrafx, and again when re-released.
Ys: The Ark of Napishtim was great fun -- played that through 3 or 4 times.
What is it about The Oath of Felghana that you like? I haven't played any of the series except the the two mentioned above.
The Oath in Felghana was the only game in the series that I played, but it just pushed all the right buttons for me. I liked the cast and plot, simple as it was, I liked the visual design of the game, and the gameplay itself was different enough that it stood out from other action-RPGs on PC that I've played. :)