Damn Page, you are on it. But don't steal all my answers.
Plus you don't even know that the Mass are incredible, yet. I stuck the package in the mail yesterday by the way.
I'll add:
If you like Sleepytime, try to find Idiot Flesh. Rare, but worth it.
If you like Pelican or Isis, try Kayo Dot. Again for a different, rarer version of most of the Kayo Dot line-up, look for Maudlin of the Well.
If you turn out liking The Mass, get Ephel Duath's album Painter's Palette.
Not sure if you dig the -core stuff, but I'm digging Norma Jean as of late.
If The Red Chord or DEP are too musical for you, check out An Albatross. They are about as spastic as I have heard.
If you want to get into something without any metal influences you can post in a thread I created called, You'd Like. It's been pretty popular and successful for the most part.