Since you don't get direct light plasma is possibly a good option, especially if you have off-angle seating positions as mentioned above. The other thing I've noticed in watching some friends' LCD-based sets is that motion seems less fluid than with plasma sets -- like it has a hard time catching up with motion. For instance, watching a pass play in football looks much smoother and more seamless with plasma than with LCD. I realize LCD is getting better in this regard, but I still see it as a comparative advantage with plasma especially if you watch sports. LCD can obviously go brighter, but with a properly set up TV in a non-bright room you don't need that much brightness anyway. And blacks are generally a strength of plasma as well which is good for movies, but LCDs seem to also be catching up there although at a price premium for now. Oh, and I'd bet the plasma would come in quite a bit cheaper. LCD would be thinner and lighter, but that doesn't seem to be much of a concern of yours.
By the way, I've had a 50" Panasonic plasma in very heavy use for about six years and am thrilled. No problems and great picture. Samsung also supposed to be good for both plasma and LCD. If you live in an area where you have power outages or brown outs you might consider a good power conditioner (such as APC, etc.) to protect your investment. One last piece of advice: buy the biggest TV you possibly can -- over time everyone I know (including me) wishes they got a bigger TV and nobody ever says they wish they went smaller. Best of luck.
By the way, I've had a 50" Panasonic plasma in very heavy use for about six years and am thrilled. No problems and great picture. Samsung also supposed to be good for both plasma and LCD. If you live in an area where you have power outages or brown outs you might consider a good power conditioner (such as APC, etc.) to protect your investment. One last piece of advice: buy the biggest TV you possibly can -- over time everyone I know (including me) wishes they got a bigger TV and nobody ever says they wish they went smaller. Best of luck.