Porcupine Tree - Particularly their In Absentia album. Great stuff. Steven Wilson's a great vocalist. But chances are if you're into Opeth, you're already familiar with them.
Steven Wilson's other project, Blackfield is really good, too. It's basically him with Aviv Geffen, an Israeli pop star, making music that would make Radiohead seem like happy, cheery music.
Oh, and you can't go wrong with anything from Mike Patton (Faith No More, Mr. Bungle, Fantomas, Peeping Tom, etc). Mike Patton's voice is out of this world!
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I still wave at the dots on the shore
And I still beat my head against the door
I still rage and wage my little war
I'm a shade and easy to ignore
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