i used to game on a 20" sony SDTV for the longest time, idk i just didnt like the LCDs, ive tried a few of em and ended up returning em for issues like poor viewing angles flash lighting/clouding and for gaming response time or blurring while panning
i recently bought LGs LE5400 led/lcd tv its 32 inches it uses a IPS panel witch has great view angles and the blur or muding isnt as bad, the blur issues are not as good as a SD tv or plasma but there not unbearable as the older LCDs. i would recommend anyone getting a LCD for gaming to choose one from panisonic, visio or LG b/c the use of IPS panel
i had some issues with it in my first few weeks it was hard to adjust to its size i would get headaches or feel dizzy but now im good, i wouldnt go with any thing bigger than 32 b/c i sit about 5ft from it while gaming online idk i tend to play better that close