Dhcod, you have a very nice system. Buy a sub which is built for music, not home theater. I went with a cheap model a few years ago just to see what a sub could do for my system and the end result was that all the detail in the bass was lost, the sound was no longer musical.
I think you need to be in the $600+ range like the SB-12NSD or a used REL or Velodyne.
I think you need to be in the $600+ range like the SB-12NSD or a used REL or Velodyne.