What kind of screen? Fixed, motorized, manual pull, AT, etc?
Will you be watching 3D? If so you should consider higher than 1 gain in a family room.
What colour walls?
I have a HW50 but I have it in a dark cave environment with a Elunevision matte white 4k fixed screen. I got the screen from costco.
It does very well with low or no ambient light but light from the side washes out the picture quite a bit. If I had to do it again I would look for a 1-1.3 gain grey screen.