In reply to:
As far as higher resolutions go, that's all well and good, but upsampling an image that's inherently 480 lines to begin with will produce artifacts (such as softness) unless you're doing even-multiples. I prefer to have my 480 lines be sent to the screen at 1:1.
Nothing's perfect. Either you scale or you see scan lines when you have a very large image and a sharp projector. I don't know any front projector owner who wouldn't choose the output from a good scaler to be the lesser of two evils.
But I'm getting off topic since this thread was never meant to be about front projectors...
-Dylan