well personally i like kicker a lot
i used to have two 12 inch kicker cvrs that hit real hard and now i got 4 kicker cvx 15z and i only have them at an 1/8 of what they are capable of because i am saving up for batterries and they still hit pretty hard
but th thing with kicker is that if you dont have a box built to there specs they dont sound nearly as good as they can