I realize that a tv has more decisions to make then an alarm clock, my speculation was more along the lines of is a $20 alarm clocks circuits really that much more robust then a tv or dvd players?
I think the trouble with most of the computer battery backups is that since they are designed for computers that don't care what kind of signal they're getting the easy way is for them to output in a modified or stepped sine wave. The more expensive ones will output a true sine wave which is what ac motors need.
I saw at future shop the other day a Monster brand power bar with the phase one power cleaner for $99. I guess if I looked at it as $40 for a decent powerbar and $50 for a power cleaner I could justify it if the consensus is that the power cleaners aren't just smoke and mirrors. I think the most fool-proof protection would be one of those "always-on true sine wave" UPS's but that's an investment of another $900.
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