I have a Cheetah branded dual cantilever heavy duty wall mount for up to 63" plasmas (180lbs). I used it for less than a year before I had a disastorous incident (not the mount's fault, it was my fault). Anyway, I am not using this mount anymore and thought I'd offer it up.
Here is the one I bought. I paid $220, they sell for $180 now. I'll consider any reasonable offer, say $100?, if I don't have to ship it as I don't have a suitable box anymore (the mount is big).
As a bonus, I'll throw in a broken 58" panasonic plasma.

The mount allows a lot of movement of the screen, side to side, tilt up/down as well as leveling and in and out from the wall. The mount itself is very rugged and sturdy. I trust it to hold the weight of a very heavy display provided the mount is anchored to the wall appropriately (my mistake

), even with the leverage of full extended out from the wall.
The mount has good reviews, the nitpick, as I too have is the weight of the display pulls the tilt down with my 150lb plasma. Two additional tightening bolts can be added (obtained from HD) that will do the trick. I don't know why it just didn't come with these already.