Henners91 wrote:
Chaos Space Marines: Comparatively unique to 40k... "Dark side" faction. Seeking power at all costs/furthering the goals of a bloodthirsty deity, I get a Sith vibe... in the simplest terms
A guy named Michael Moorcock (moment of silence for pity for a writer to have such a name) was a fantasy writer in the 60's onwards, he wrote the antithesis to Conan, Elric/Stormbringer. I'd suggest checking out his Eternal Champion serious, which is where Chaos in Warhammer comes from, although he kinda sourced it off Poul Anderson but thats another can of worms isn't it? If you enjoy chaos fluff, I would highly recommend the Elric and Corum books.
http://en.wikipedia.org/wiki/Eternal_Champion
http://en.wikipedia.org/wiki/Law_and_Chaos
http://en.wikipedia.org/wiki/Elric_of_Melnibon%C3%A9
http://en.wikipedia.org/wiki/Corum_Jhaelen_Irsei
(actually, if you read most of the Eternal champion books, you'll find ALOT of pre-
GW things in there, both fantasy and
40k 
)