Be very careful with LCD. Im am a huge gamer (3 comp monitors set up so i can play on the middle one and run aux progs on the other two), numerous consoles etc etc.
When you get over 32 - 36 inches with an LCD screen your just really upping the risk of burned out pixels. Manufactures usually expect 15 or something to go every 2 years, which is absolutely ridiculous, if you get one mid screen you'll be really disapointed. Currently I have a LCD monitor with one burned out pixel on the far right and its only 5 months old, drives me insane.
I wouldn't go with anything but plasma for tv, the resolution you're talking about on tv is still only about 60 percent of what a computer runs and plasma is more than capable of looking really really good with it. As for low light, stay away from the generic brands as you notice a big drop in quality there.
If you do happen to get the LCD one, buy the stores warantee thing and make sure it covers like 3 - 4 dots or something. Realistically though, within 3 - 5 years, which the warantee won't cover, you're going to have burn outs start to increase.
As for the couple of posts speaking about plasma burn out, they may have lcd confused with plasma. LCD is basically thousands of different dots on your screen, each one capable of burning out (never apply any pressure to a lcd screen beyond a very light wiping, it can toast the lights immediately), plasma is fundamentally different.