Blood on The Ice, for the reason's that you gave. Also "Seige on The Dragon Cult" I really like Forelhost. Well written with the notes and reasoning behind it all.
You know, I did Forelhost just the other day, and I felt like I must have missed something. I found the journal you're directed to, of course, and then a note named "Reply from Rahgot" - but what was he replying to? I felt like there should be more notes, and I think I was in every room in the dungeon... Must have missed a room somewhere.
I liked it, though, it's always nice when dungeons are more than just dungeons.
I recently did Waking Nightmare for the first time - well-written, a little different, and I just adore Erandur! Characters with a good backstory and some inner struggle can't be wrong.