Originally Posted by Iceman
It's a bit different when you're using a projection system in a less than ideal environment. Depending on your furniture configuration and wall decor you might have to sacrifice significant screen size by going with a screen. Without you can use the whole wall from floor to ceiling and although some intrusive objects might get in the way and ruin part of the picture you still have a cinema like screen (and still of good quality depending on whether you have painted walls/wallpaper & the texture/uniformity of it)
A good TV might be a better choice for the space, then. It's not like people buy tickets to go see movies screened in the home decor part of a department store.