I have two APC UPSs. One for my computer - if/when the power goes out, it operates on battery power long enough for me to save what I'm doing and shut down everything properly.
This may sound like heresey - but I use one for my stereo - B60, Rega Apollo, Pro-Ject 1Xpression, and Apple TV and DAC.
I live in the Metro NYC area. Thunderstorms are very common. My power quality sucks - turn on a Forman grill and the kitchen light dims for a second. Seriously. My landlord has had the power company and a few independant electricians access the situation. Bottom line is the power company is awful. Everything is safe from a fire hazard standpoint though.
The APC UPS cleans up the signal a bit. It was better than the Monster unit I tried and returned. It also does voltage regulation. The voltage drops every now and again, and the unit beeps once or twice. Nothing connected has had any electrical damage.
The units each cost me about $150. I've tried some other audiophile units, and nothing was worth keeping over the APC for the money. I haven't tried a Torus, nor does it make financial sense at the time (my money would be better spent on a new DAC). I haven't tried any other product in this price range.
A lot of people haven't had good experience with computer power conditioners/surge protectors with hifi equipment. Maybe I got luck and stumbled across the right one. Maybe I'm deaf. Who knows? The only thing I can say is it works very well in my system.
When I buy a house, I'll definitely get a dedicated line for my stereo. They're cheap enough, and its been a very big improvement in every system I've heard them in. There's a lot worse ways to spend $200 or so in audio.
It should be noted that my B60 and Apollo are both being repaired as I type this. To the best of my knowledge, neither has anything to do with electrical quality. If that changes, I'll update.