Alex, unless there's a specific 42" set that you really want, it doesn't seem worthwhile to complicate the mounting process for the slight difference from the 39" models.

Looking at the 39" sets tested in the March Consumer Reports, that exact Seiki finished 11th out of the 12 sets in the category, most significantly being two high-def picture quality grades below the top sets. The top set from the tests was this Samsung , available for $377 at Amazon.

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Enjoy the music, not the equipment.