Imo, Sleeper. The fact that he has only be killed once should tell you this. I would say that if you compare it to a mob today on live, it would count as a boss mob from Anguish (if that's still the high end zone on live that is) then times it by 2.
Edit: I say Sleeper because he was super hard to get to in the first place, and the types of equipment that was available made it even harder.
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