Check out Elemental Designs or CDT also.... Ross can maybe hook you up with something good from CDT if you PM him...
I used to have an SQ-1200 series sub, and it was really nice sounding, blended in very well with the rest of my setup. Heard some EDs too, very nice as well...
I'll be getting some more CDT subs hopefully in the near future as well... but, for the time being, I have some new toys to play with...

*cough* ES 06+ *cough*