I agree with the Audioque suggestion. A single HD3 12 ported with a good amount of power kills for a daily setup. A guy here in Z-Ville had one, 4.5 ported tuned to 32 hertz off of an Opti1000D, and it was **** loud, probably low 40's on a TL with tones, and that's with a crappy electrical system and 2 amps in a T-Bird. It was one of the louder setups in town. The only two that would stomp him around here are SJ's Suburban (4 15's ported, about 4kw total) and Anthony's Cirrus (6 13w7's walled, 6 1000/1's).
Give AQ a call, I doubt you'd regret it one bit.
Morgan