I also am trying to balance both. I have had great success with the Paradigm Servo-15. However, no matter what you do, 2 subs will almost always sound better than 1. I am considering 2 NHT Sub Two's or 2 Vandersteen 2Wq or V2W.
Subwoofer for Both Music and HT
I have seen forums for subs for one or the other but not for both. Any opinions out there on subs that will work well for both 2 channel and home theater? I have Merlin VSM-M's in the front with a VSM-CC and an older pair of VSM-SE's for the rear. Appreciate any feedback on what has worked well in your systems