I still have 15 Horus Heresy Books to catch up on, a half dozen audio dramas, and a crap ton of short stories. With the way the story is going, I am probably going to need to keep up with all of them, because [i]holy shit[/i] are they getting oddly interconnected. If you didn't get one of the audio drama spinoffs, you would never know a main character than seemingly died actually survived which is important because he returns in book 29. And then you have the Cabal and Alpha Legion plot, which seems intent on getting everywhere. Then I have ASOIAF, Discworld, Breaking Bad, House of Cards, and Batman Eternal eating up my entire comic budget. I'm swamped with stuff. :(