for SQ or SQL, my votes go for DD 2500 series, 3500 series, 9100 series, 9500 series, or Treo TSX, SSI, SE, IDMAX, TC Sounds, Zapco Competition or Reference subs, but all depends on the whole setup.
Personally TC Sounds and DD would be my choice. I havent been a fan of JL since the original W6...