I know that you can piece together a Sanus Synergy system. The VP150 height was what narrowed it down. However, I don't see the Synergy on the website, maybe it has a new name.

I bought it new years back at Magnolia. Then I found extra pieces locally on Audiogon. Worth a shot. BDI may also have something.

Bear in mind, these aren't the cheapest...

I have the Synergy and was going to get the top platform to put the plasma on top w/ the VP150 underneath. However, I ended up just wall mounting the display. Oddly enough, that ends up being cheaper, at least in my situation.