I would go with JL over Kicker.
For those looking for the optimal sub setup, we have used Image Dynamics IDMAX 12" on our last two demo boats. These subs can handle over 1,000 watts and have dual voice coils.
Image Dynamics wins most of the car audio competitions because they are faithful to the music while extremely efficient (violent SPL).
We use two of the 12", 4 ohm, dual voice coil version wired at 1 ohm. We are powering these two subs with a Tru Technology H-1 Hammer mono amp that is rated at 1,500 watts at 1 ohm (probably over 2,000).
We already offer the Tru H-1 Hammer amp at Wakeside. http://www.wakeside.com/page/W/PROD/tru_technology_amplifier/tru_technology_h_1
We will offer the Image Dynamics IDMAX within the next week or so.
We truly believe this is the optimal sub design. Anyone interested in upgrading you subs, check it out.
(Message edited by wakeside1 on March 12, 2005)