I picked up the Daemonhunters codex, to add some nice cheese to my Traitor Guard. I'm thinking an Inquisitor Lord and retinue, Assassin, and a unit of Grey Knights. My traitor versions?
Foul Corrupter: Reaper's Angel of Death as Inq. Lord.
Mutant Sorcerors: Various magic users (including a squiddie) as Mystics
Zombie with a chainsaw as either a servitor or a hierophant.