I'm probably the most in-between member on the board (guru/n00b) so let me give you my list. Keep in mind that I can only speak from what I've heard, not say-so

Subwoofers:
1: Kicker
2: Memphis
3: Rockford Fosgate
4: Audiobahn
5: Sony

Amplifier (Subwoofer):
1: Rockford Fosgate Punch "Old School"
2: JBL
3: Alpine
4: Power Acoustik
5: Sony

I don't see the point of these lists, because specific setups will sound different for everyone. Box size/type, wiring kits, headunits, and even number of passengers will make anything sound different. But my lists consists of things that I've owned. The Kicker Solobaric L7 was a monster, and even though it was hooked to the JBL, the Rockford Fosgate Punch 500a2 made even my Audiobahn sub beat.

1999 SE White AVH-P6500DVD Infinity Reference 6500CS Pioneer 5x7s Punch 360a2 Punch 500a2 Adire Tempest in a custom sealed 3.4cuft box Modded Xbox Still need Midnight Cloth Headrests... and if somebody has fold down rear seats....