I've been a firm believer in good power filtering since I moved into my Chicago apartment as a kid and couldn't listen to my rig due to the line noise or watch my projector due to the power fluctuations. My first piece of real gear was a power conditioner and it was a revelation. I recently have put my dream system together and spoken to the Benchmark, Pass and SVS and all of them say to not use a power conditioner because their internal filtering is so good. I listened and can't hear the slightest hiss or pop out of my 20.1 Maggies, Kinnergetic or SVS subs. I did want surge protection and have bought The Yalu Bulala from Blue Circle Audio which I put in the outlet of each circuit and it will sacrifice itself, take a lightening strike, and save your amps. Since it is in another socket on the outlet it is non current limiting as well. I also bought an FX2 X0E line conditioner for my smaller sources which are not current hungry. Blue Circle also makes a Sillycone Filter which draws the noise out of the circuit if it is plugged in near the amp (also non current limiting) if you have an extremely noisy environment. These products aren't going to win any industrial design awards but they work great and don't break the bank. Just my 2 cents. . .
Good luck!
