In the Uniforms of the Empire book there's a Knightly Order shown in there - The Order of the Black Rose. Obviously these guys are devotees of the Death God, and here's my POC model for their Order. I'm pretty happy with how he turned out, and I like the massive bulk of the Chaos Knight horse.
If I end up going with this approach I'll need to pick up a few things, such as a dozen 'skull helms' from the Chaos Warrior sprues, and almost the same number of Empire Lord lances. For these I'll be heading to my friend Alex's revamped bitz store at Battleroad Games & Hobbies. He has recently uploaded around 250 different 40K bitz and will be adding Warhammer bitz very soon. If you are looking for 40K or Warhammer bitz, and a bunch of other miniature ranges, check him out.
Let me know what you think of my POC models.