I'm using the stand from my Sony 36XBR800.
I figure since it held that 260 pound TV it will hold any TV in the future. LOL.....
I bought 2 anti-theft cables and will attach them to the back of the Plasma
via the VERSA mounts and run them tru the stand.
I figure no theft is going to be able to carry a 80+ pound stand and the TV!
Your only hope is cabinet maker who can build a stand that WILL SAFELY hold
that 300 pound tv and include some way to attach it to the TV.
The front of that TV is where most of the weight is since Sony had to add a extra
plate of glass to the front of the picture tube to make the large 40" screen work
and reduce the 'green blob' problem.
I'm sure there is a cabinet of some sorts that will hold it.
I guess you will have to ask some local stores and explain the weight issue.