I have a question reguarding the power source for a home theatre. As it is, I have, plugged into the same power bar, a Denon 1602, Ep125, JVC DVD player, and Sony TV. Sometimes, when I am listening to music or watching a movie, and I shut the sub off or turn it on, it causes a huge 'click' sound out of all the speakers like as if a power spike might have gone through. The TV picture will also wave a little. This happens almost always when I switch the sub on or off, but has happened once or twice when switching the tv on or off.
The plug the power bar is plugged into is grounded.

Do I simple need a better power bar or do I need a power conditioner because of the amount of things I have plugged into it? I was recommeded by a fellow computer technician to use a UPS, but those are a few hundred dollars, and I don't want to spend that much.

does anyone have any less expensive suggestions, or just any suggestions at all?

Thanks!