I've only found about DFA1979 thanks to this board, and they seem rather good, but allow me to say: Everything DFA1979 does, Lightning Bolt can do better. Except for singing, because Lighting Bolt don't sing. But their music simply rocks a lot harder, though that's just my personal opinion of course.
Oh, wait, another thing DFA does a lot better: They're socially more acceptable, for example at a party where you want to dance to decent music. Not that you can' dance to Lightning Bolt, but people might just leave the room.
Still, for those here, who are interested bass/drum bands now, I've got some for you, along with MP3 links (legal ones, of course):
Lightning Bolt - Download Dracula Mountain and be amazed. This band kicks ass so hard it's unbelievable. But I think the MP3 is cropped at some point.
Ruins - A noise band from Japan. Rhythmically extremely complex stuff, tightly played and sligthly insane.
And from "I can't believe this qualifies as music"-department:
Burmese - 2 drums and 2 basses and more hate than every other band on this planet. Sick shit. Is that even music?
the White Mice - Bass, drums - and an oscillator. It's noise, but it's asskicking noise.
I assume, Lightning Bolt is by far the most interesting option here, but if you want to, give the others a shot as well.
But I demand that you listen to Lightning Bolt!