I own both the Sig 7000 and a regular AVS2000.
The AVs2000 strengthens the low end sound.
I paid $900 last year for the 7000ss and $700 a few weeks ago for the AVS2000. (both locally)
Remember the 7000 balances the power, so avoid sticking lights into it or be careful about the socket when changing bulbs as the ground side is also 'live' with balanced power.
Prior to owning the AVS2000 I daisychained the 7000 and a 5000, doing even more for video. but adding the AVS to the chain sems to weaken the picture. (the color clearly is washed out... )With the AVS2000 any conditioners following it cannot be daisychained from one to another or negative results occur. (Daisychaining more than one conditioner is not common. I did it and now need to stop doing it when the AVS2000 is in the system too.
With the AVS and just one (Monster 5000) the picture is fine
The main thing is that like powercords, the various items have various flavors. The thing about conditioners, is that you get a 30/60 lb chunk of stuff for your money, not just a gardenhose with wires inside. And the conditioners can service multiple items, not just one.
Be wary of Furman midpriced conditioners... $450 to $550 list and inside are the same $10 of parts as in the powerstrip. I laugh at the Furman claiming "digital" conditioning when all that is on that part of the circuit is a single common Ferrite choke! (At least I had several in my homemade powerstrip!!!)