I have also been looking at purchasing a 6500UB as an upgrade to my Sanyo PLV-70. I've got a Da-Lite High Contrast Cinema Contour 106" screen (~0.8 gain grey), at 14' throw. It is located in a walkout basement with curtained off windows, so I can get fairly dark if need, although there is a little bit of 'dusk level' illumination in mid day. We also sometimes leave a light on in another part of the basement for kids playing, etc.
My question is to anyone who has a similar setup (either similar screen or coming from a PLV-70). How does the 6500UB look on the 0.8 grey screen? Is it bright enough? I'm used to a pretty bright initial (it's probably 50-75% after a few hundred hours, however) image on the PLV-70, so I wonder how close this will look to what I'm used to. Note that one of my complaints on the PLV-70 is that the bulbs do tend to dim fast (and I'm lucky if they live 500-700 hours!). One of the selling points of the 6500UB is actually the long bulb life. Hopefully it lives up to something close to the advertised 4000 hours.