Good clean power on the cheap....Cadence.
Me and Matt have the same philosophy but we say it differently. Your goal should be to to move as much air space as possible if you're looking for decibels. That doesn't mean bigger is better. Personally...anything above 120db is useless for daily driving. I just don't see how it's enjoyable :/
FYI: 155+ db's using a 6.5" subwoofer in a 6th order bandpass. Your goal should be efficiency. More power doesn't always do the job. EDIT: (this was a burp...not music!)