How about the Rifters trilogy (Starfish, Maelstrom and Behemoth) by Peter Watts? There's also his stand-alone book Blindsight. It will seem like a short story after your exposure to George R.R. Martin, but if it doesn't pack in enough dark for you, I don't know what would.
And I agree with you about the Revelation Space series (I first read it in pbook format and then naturally had to get the audiobooks.)
Cindy
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