I shall have my post up tonight, never fear. 

Personally, I'm torn between Khorne (more Blood Pact style than the traditional sense) or Tzeentch (considering his forethought into planning and manipulating his way into a position to revenge kill, and our current lack of Tzeentch shenanigans) for good ol' Ansgar. Even though I have all the rule books for Black Crusade, I'm not using em for reference, just going with personal knowledge and gut instinct right now.