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One of the cabs that Stumbo referred to is the Schroeder 1210. I have that one and love it. Lots of low end, pretty efficient, great sound.
A couple of others I really like are the Acme Low B2 (you need tons of power for that one) and the Eden D210XST. The Eden is very efficient, although some claim their specs can't possibly be true. Almost breaks the good old small/low/loud rule.