I also sit 12ft from my TV and have no light issues. I just bought a 71" Samsung 1080P DLP and am extremely happy with it, the picture is awesome. At 12ft, anything less than 70" will be dissappointing for getting the theater experience for movies (IMHO). Surprisingly, my wife thinks the same thing for the size of the picture (she rarely chimes in as long as it works). Also, you should definitely get a TV that can except (and is capable of) 1080P if you go higher than a 50" TV.
Another important thing I should mention is that the Samsung customer service has been great when I called in twice (not for problems but just general questions).
Another important thing I should mention is that the Samsung customer service has been great when I called in twice (not for problems but just general questions).

