Nod. By sensitive equipment I mean stuff like Escient Fireballs, DVD players, etc. (more on this in the last paragraph of this post) A voltage regulator should do the trick, I just threw out the UPS because it's another option for your more sensitive stuff. I probably shouldn't have even mentioned it, as a voltage regulator would be just fine for your application. But, if you already had a UPS or whatever, it's an easy thing to throw in the mix for some gear (because it does the same thing as a voltage regulator, just in a different way)
Panamax works great. What model in specific were you looking at?
A line filter is put between your incoming AC and your gear. They come as connectors... a lot of times you'll see them on the end of a powercord running to a power conditioner. Are you experiencing EMI?
Voltage regulators can be used on anything. They are especially good in applications where you have high voltage or fluctuating power. The reason I mentioned "sensitive" components is because computer-like components (hard drives, DVRs, a lot of sources) are sensitive to high voltage. They, slow fry, for lack of a better description. Amps don't seem to care as much as the more "techie" components.