Well, I'm a bit of a quirky person, so the ones I'll list will likely be ones I've been involved in, but the reason I was involved in them was because I liked the games so that would be a good reason the list works like that.
5. Feda: The Emblem of Justice
4. Record of Lodoss War
3. Villgust
2. Phantasy Star Gaiden
1. Ranma 1/2 RPG
Not only is Ranma my favorite game that we've done, it was also the most fun I had on a game we've done. It was an enjoyable process of working with Wildbill to make sure the style set forth in the game matched up well to what Viz had created for the anime market. It was challenging at times but also rewarding, and after Destiny of an Emperor II which felt more like a chore to me, it was nice to have something I completely enjoyed working on again.
I have no doubt that stuff in the pipe will knock some of this off the list. Record of Lodoss Wars is easily able to be knocked off simply because the game only told half the story. Feda, as much as I liked it could be toppled because I don't care for Strategy RPG's, but it does have a great story. Even Villgust and Phantasy Star Gaiden aren't totally safe
I doubt that Ranma would fall completely out though. There are games in the pipe that have the potential for me to knock Ranma out of #1, I'm not sure they will though, so I'll keep the list limited to released games at this time.