I used one of these
http://www.standanddeliver.com/acata...unt_UCL-X.html for my Panny 58" ..however, i did need a particular type of mount that would sit 4" out, but flush with a surface 4" out as the mount is in a recess behind the main TV, the TV covering said recess (if you get what I mean) ...anyway, these are like the Rolls Royce of mounts, top quality materials, constructions, instructions, bolts n screws...everything spot on with adapter kit for every TV on the market supplied
Obviously if you dont need a mount like this, they do cheaper ones, but saying that, I paid £319.99 for mine about a year ago ...just cant remember where - sorry.
But if you have a £3-4K TV I would be wanting to know that its on a safe, quality mounty - this can hold 90Kg, and after mounting it I swung around on it myself at full extension, just to be sure
On the other hand, I needed to mount a 37" LCD in the bedroom, bought a cheap mount of ebay for £50...now it does the job, the but the quality of the metal, general construction, instructions, screws/fittings ...everything about it was of a much lower quality and it took a lot longer to mount before I was happy with the TV being on it ok.
You pays your money, and takes your choice.........