Warhammer 40K Suggestions?
What Girls Said 1
I'd say the current 40k rulebook, but you probably mean the novels... =P
@Kairnoct is a better lore study than I am.
What Guys Said 2
Personally I've really like the Ciaphas Cain book series as it has it's humorous elements along with the action and intrique. If you'd rather read more focused on Space Marines though, then starting with the Horus Heresy series is probably your best bet, even if it doesn't exactly happen in the grim darkness of the 41st millenium which is the current age in the setting.
any of the battles books, even the heresy books are good. plus there is the beast arises series. check a site called black library for them
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