Dan,
Thanks for the response. I'm still looking, and so far, the only option other than heavy drapes is a horizontal blind, which will set me back anywhere from $300 ~ $700, depending on manufacturer and options.

I'm still looking around, and I think I'll probably end up going with a set of room darkening verticals, and see how bad the light transmission is. If it's too bad, I'll then probably go with a set of heavy drapes on top of the 'verts -- that'll be my excuse to buy a motorized track! I may make it so it's part of the drapes that's behind the TV.

I am looking at using a bias light behind the TV as one of the final touches -- I'm trying to get past the issues I currently have first!