Thank you for your feedback. After much homework today, I have focused on the following conclusions ( but open to being challenged on these):
>Staying with one sub (for now) mainly due to relatively modest room size and potential integration issues;
>Buying new rather than used. All of my equipment is "gently" used and I have had zero issues with any items ( almost all purchased through Audiogon). But too many problem stories online regarding used subwoofers;
> Since I am buying new, I am focusing on the $800 SVS SB 2000 PRO, an new addition / upgrade to the SVS line. As such, if it proves to be a good fit, I will be able to match it with a second one if I end up taking that path. The SB2000 has been around for a while, is a sealed sub which reviews claim provides a tighter response. The newest version adds some additional wattage, additional range (19hz-240hz~3db) and control via and app used in their higher end subs. Considered the SB3000, but seems like overkill for my needs and costs $300 more.
> While SVS seems like a home theater brand, I have not found many people bashing it for two channel music.
Anyone have direct experience with these? Any thought on sealed vs ported for music?