if ur referring to RATM (rage against the machine) then get The Fight For Los Angeles. i liked that album. but i haven't heard ALL their albums. their other albums should be just as good or even better.
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Life is short and the art long, the occasion instant, experiment perilous, decision difficult.
I'd say that their s/t debut is their most complete album. It has raw fury from start to finish. You really can't go wrong with the Battle (not fight) of Los Angeles, Evil Empire or their self-titled albums. Renegades is pretty good, but it isn't necessarily representative of their overall work.
The live albums are good if you liked their other stuff; it's basically the same stuff, only live, so make sure that you actually like RATM before buying them.
wel to tpmanno i agree with hockey that battle of los angeles is great..and id'; consider their second best...in my opinion their first album (self-titled with "wake up" on it) is the best.....get that one before you get battle of los angeles