As a relatively low resolution, HT LCD projector (there are lower resolution WVGA LCD models, like Epson's Home 10+), pixels are fairly large and visible. Since LCD pixels are more visible than those of a DLP projector, you will see them at a slightly greater distance than you would on a DLP projector like BenQ's PE5120 (WVGA). It helps that the HC-3 is slightly higher resolution.HC3 projector - daytime image from Bulletproof Monk
What of it? If you are completely pixel adverse - you don't want to see them at all, you are going to have to sit back a distance about twice that of the screen width. So if you have a large, 100" diagonal 16:9 screen, that measures out to 87" wide. Twice that is 174" or 14.5 feet.
However, again consider what you are watching. Many will find that they are happy overall a bit closer to that, say 11-12 feet for that sized projector screen, and sports fans might be happy even closer.