Despite the possible nepotism (I beta'd this fic :) I have to give special shoutout to
borgmama1of5 's mini-epic
Revenge of the Jedi. Its got this twisty, clever plot that dug into my bones. A dark!Dean that gives goosebumps. Unexpected turns and one of those endings that lingers for long while.
No spoilers beyond all currently aired episodes. Heed the warnings -- although everything that happens, no matter how painful, is also painfully necessary.