I have one of those openings above the fireplace where my current 42 in LCD TV sits. I just got a new Sony 4400ES receiver which really makes it sound amazing but now the screen's too small. There are also in-wall speakers inside that opening. I've been toying with the idea of getting a screen and a projector which would cover that entire opening, so it would need to be acoustically transparent. Since I want to be able to use the TV during the day the screen needs to be retractable as well. Any ideas on the best way to deal with this or any screen recommendations?
Here's what it looks like

Here's what it looks like

















