I bought a 50' Plasma Thursday night. It was $400 off this week. The Best Buy guy walked me right over to the Monster Brand HDMI cables and Monster Brand Power conditioners. He was recommending the Monster clean power conditioner. Once I saw Monster Brand all my ears heard was blah, blah, blah after that. They think they can convince you to buy Monster stuff by saying stuff like - Protect your investment, and get the finest HDMI cables so you'll think any other brand HDMI cable will make the picture look like shit.
One of the Monster brand surge protectors even features a digital LED voltage meter so you know the incoming voltage at a glance. I'd bet that's just a display programmed to randomly display 120 +/- 10.
I bought a 6 foot GE brand HDMI cable at Mills Fleet Farm for $12.97 and a Philips surge protector for $20. I'm sure I'll be just fine. I don't think the TV will get fried because I don't have a UPS.