hairlesswookiee
PALPATINE CRUSADER!!!!
i like all of these and also would add:Graphic Novels:
Killing Joke
The dark knight returns (not the sequel though)
Long Haloween
Arkham Asylum ( suggested for mature readers though)
Trade Paperbacks:
Batman Knightfall ( breaking of the Batman)
Death in the family (Robin dies)
anything by Neal Adams as he redefined the character's dark roots in the 70s.
Gotham by Gaslight
Batman and Dracula: Red Rain
Hush