THIS IS SO EASY
Other than HU (which would have to be Eclipse or F1, maybe P9 or Clarion by McIntosh)
High Level : DLS! Great Components, amps and Woofers.
Tplaya07, you have that DLS Iridium Sub review ready yet? So far everyone I have read has me convinced that if i could afford it that is would be heard to beat, very hard to beat.
Mid Level : JL-Audio, Eclipse, Diamond
Budget : A Bunch of Cheap-o Brands all mixed together.