I just purchased a 4:3 XGA 720p projector and RF electric 120" screen figuring I could just shrink the screen back to 16:9 by using the remote when I needed to. After a little research, thinking and testing, I have noticed that the HD signals look better then DVD and Digital cable - but not as good as my 57" HD Rear Projection TV. If I am correct with my calculations, this would be why: WIDESCREEN MODES (*Support by 720p 4:3 projector) 480i - 852x480 - 408,960 pixels - 12.24 Million Pixels per second * 480p - 852x480 - 408,960 pixels - 24.48 Million Pixels per second * 576p - 1024x576 - 589,824 pixels - 35.38 Million Pixels per second * 720p - 1280x720 - 921,600 pixels - 55.29 Million Pixels per second 1080i - 1920x1080 - 2,073,600 pixels - 62.2 Million Pixels per second 1080p - 1920x1080 - 2,073,600 pixels - 124.4 Million Pixels per second My projector is only able to work with 576p when fed widescreen 720p and 1080i content, so i am basically sacrificing 35-45% of the video quality of all widescreen HD signals. POOP! I guess that is the #1 reason to get a 16:9 screen & projector vs. 4:3. I got the 4:3 because it would be for mixed use, DVD, HD-DVD, Digital Cable, HD-Cable, HTPC, XBOX360, etc.