Originally Posted by prepress
I recommend power protection highly, as well. There are also performance benefits to be had. I heard an audible difference in my turntable with/without a conditioner; the sound was cleaner with, grungy without. Perhaps one with voltage regulation also, to keep the 120v constant; not only can power be dirty, but voltage levels fluctuate also, and I don't think that makes AV equipment too happy either.
I have a UPS on order, to which I plan to connect my TV (when I buy it), as well as my new computer.
Dirty (noisy) power, spikes or brown-outs can obviously be problematic if they are common in your environment.
Small line voltage variations in reaction to loading at different times of the day are not really a problem for the switching supplies used in modern CE components.
Most quality UPS do a fair job at filtering and giving you some protection during brown-outs as well as outages.
Outage protection is most beneficial for recording devices, especially hard disk like PCs, DVRs, etc. But there is some support for using it for lamp protection for projectors displays, etc. and maybe it has similar benefit for plasma.
For outage protection for the above devices, you do not want anything that will remove power during huge transitions, but rather absorb it or switch to back up power.
For other electronics, the best protection may well be opening a circuit. After all, the ultimate protection is no connection.
My only point being you should be aware of your immediate AC environment, the equipment you are using, and what you want to achieve in order to make a wise choice. There is no reason to spend a lot of money unless your needs require it.