LCD Television Noise ???

I am contemplating the purchase of a 26" LCD television in the near future and have been browsing the web gathering information. I am considering Panasonic, Samsung, Sony and Toshiba. I read one review where the television emitted a subtle yet annoying high-pitched whine. Actually, my Dell high-resolution flat-screen computer monitor will do this until it gets really warmed up. Said televison was replaced twice with new units which all made the same noise. This would drive me crazy. Can anyone tell me if I should expect LCD television sets to do this, perhaps some worse than others? If so, which of the brands I mentioned would whine the least? Thank you!