Café de Nuit

I have to go with II, although I'll admit that it's a pretty subjective decision since it mostly revolves around the fact that II features lots of crunch on Darkon, my all-time favorite domain. It also succeeded at the near-impossible feat of making me interested in Lamordia. I'd say III for all the incredibly useful Church of Ezra goodness and for making Godefrey a menacing darklord if the Mordent section weren't so darn long . . .

I voted II. After discovering Ravenloft through the Campaign Seeting, I wasn't disappointed when it was time to read the bigger descriptions of each Domain. It made Darkon my favourite, while making the other three domains interesting. it showed interesting characters, such as Mordenheim, Azalin (and his commentary in the margins are another big plus), Drakov, Dachine, etc.

Really good. But hey, maybe I'll think differently when i have bought I, IV and V.