Vanderstein subs are by far the best I have heard, made my velodynes (soon sold) sound like automotive subs. Cost of new subs ~1300 each. Richard Vanderstein would probably be happy to talk with you about integration with your 2ce's.
Best Sub Rel or Muse
I am looking for a high quality sub suitable for both music and HT. I've heard the Muse 18 and Rel Storm series are good. Which is the best? Also any other recommendations in the 12-1400 range used would be appreciated. My front speakers are Vandy 2CE's. Thank you for taking the time to help me. Rick