Bad Brains have four or five live albums, I'd say either get Live At CBGB's 1982 or Live from their 1988 tour.
For similar bands:
Adolescents: S/T
Scream: Still Screaming
Zero Boys - Viscous Circle
are a few to check out, that is if you aren't already farmilar with all the mor epopular ones like Black Flag, Circle Jerks, and Minor Threat.
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