Peerless is what I have my 60" hanging on...forget the name of the brand my 42" is hanging from though I do remember it was Made in the USA and pretty friggin' stout..
I did a ton of research on this very thing recently so here's what I found. I would suggest checking at the Radio Shack website and the one for Peerless brand (which Radio Shack sells) at peerlessmounts.com and AVF brand (avfgroup.com).
And DON'T run the power cable that came with the TV through the wall. It's most likely against code and if it ever catches on fire your ass will be in a world of trouble...and forget any insurance coverage once they find out you did that. If you're running any power cable in the wall, use romex of the proper gauge.
Get a circle drill bit. Drill at the top where you want the wires to go in and one at the bottom for them to come out. They have covers that make the holes look nice. Make sure you hit a stud for your bracket otherwise the dry wall will come down.
Edited by shinner, 14 February 2009 - 11:48 PM.