I second everyone mentioning Atheist.
However, I'ma list some shit that's not necessarily metal but very inspiring and bass-filled nonetheless.
Violent Femmes- s/t. This is honest, acoustic rock 'n' roll with a highlighted Brian Ritchie tearing up his Earthwood Acoustic.
Emerson, Lake and Palmer- Pictures at an Exhibition. A live rearrangement of classical Russian music for bass, keyboard and drums. Just awesome.
Muse- Absolution. Friggin' throw on a track like "Hysteria" and TRY to tell me that Chris Wolstenhome can't tear it up.
Schoolyard Heroes- Fantastic Wounds. Local band here, steadily getting bigger. Maiden-meets-Misfits-meets Botch. Full of throaty guitar, operatic female vocals and circular, precise rhythms. Check out Jonah's bass licks as he moves under the guitar.
Third Eye Blind- s/t. Yeah, the epitome of post-grunge pop. But Arion Salazar's countermelodies and melodic chops make this worth your money, as do the catchy hooks.
AFI- The Art of Drowning. Now they pretty much suck, but the older records are cool, macabre takes on oldschool hardcore. There's some cool double stops and great tone from Hunter on this one. Great song writing and riffing, too.
Charles Mingus- Mingus Ah Um. A jazz classic. Great upright bass tone from Mingus himself, and the ensemble playing is impeccable.
The Cure- Disintegration. A dense, heavy, emotional album. Great on rainy days. Fantastic vocals from Robert Smith. Simon Gallup really anchors the songs with slight counterpoint and rythmic drive.
There's also some band called Sadus, but I hear their bassist is a douchebag