<font color='#000000'>I can't comment on Panamax products but I can talk to the AVS 2000 voltage regulator and the HTS 5000 MKII line conditioner from Monster Power.
The AVS 2000 works well in my home when either the furnace or central air unit is operating. On average my HT needs 3 to 5 volts to maintain the 120 spec. Now this varies but when I spend $6M on a Sony LCD RPTV I want to ensure the equipment has a long life span.
As for the conditioner, the HTS 7000 is the only way to go if you can afford the steep price. I tested a Rotel RB 1090 by increasing the volume to 90% (no input source) and to my suprise, there was little to no noise. I removed the HTS 7000 to hear exactly what line conditioners are meant to do. Remove unwanted noise and the difference was night and day. My HTS 5000 is much cheaper which resulted in some noise present using the same test. In this case you get what you pay for.
Having said this, there are some people in this forum who will blast you with snake oil statements, right or wrong, but it's my HT and I heard a difference with my own ears, therefore the product was worth the money.
I do believe Monster Power does have scientific data to back up their claims as well.
For what its worth, good luck.
Scott</font>