I am building a nice AV system and wonder if I really need a surge protector. What about a power conditioner? What is that anyway? I had no problems with my old system in 25 years with no surge protector. If I do need one, how many jules. I have: 52" Sony LCD Onkyo 805 Sony DVD Sony cd jukebox Cable box Will be getting blueray all plugged into the same power strip. Appreciate any advice. Thanks