Chemical Brother and Dust Brothers are NOT the same people.

The Chemical Brothers USED to be called the Dust Brothers when they first started but they changed it quickly because of the producers with the same name. They've never used that name since.

EDIT: For that dark, non-repetitive sound, try Crystal Method's "Vegas" CD. Or try "Death In Vegas" (band name). Kinda weird how all the names blend together I know.. There is stuff darker for certain, but I asked my resident electronic guru and he recommended those two CD's for someone how likes the Fight Club soundtrack. They aren't the more experimental sound which is hard to grow a taste for.