Myself, I would like a Vampire d20 book. The World of Darkness is fun (a bit silly sometimes, since it's so much hodgepodge you wonder how all these weirdoes are still secrets, and you also wonder if the real monsters are not the plain humans, who seem to be a minority), but it's fun. But the rules, ow, the rules... They don't rule. I think they voluntarily sucks, to disgust people from using game-mechanic-handled interactions and thus concentrate on actual roleplay, but from experience, I know it's not true. At least not for us. We have the same rollplay/roleplay ratio in the WoD than in any other RPG. The only difference with D&D being that we don't enjoy rollplay in the Storyteller's system. The Rule of 1, notably, makes the whole scenes ridiculous. I have thought of adapting the Exalted upgrade of the system to correct that.