Here are links to two photos of my recent project switching out the old TVs for new ones.
I used a Monster brand arm, and doubled up 3/4" cabinet plywood to form the back.
Hope the pics come through ok, this is the first time I posted pics.
Front TV 2005 FW Expedition
Front TV 2005 FW Expedition Monster Bracket Samsung 40" Smart TV
TV Replacement 2005 FW Expedition 2013
Next is the bedroom TV. I picked up a 29" Samsung. Found out that the screens come in a couple different thicknesses, and the slim line worked great.