For response time/screen lag, plasmas are the best for gaming. I'd only stick with Panasonic though because they have the best anti-burn in and anti-image retention technology in their plasmas compared to say LG or Samsung.

Just know that within the first 100-200 hours of use (whatever the manufacturer recommends) you should 'break in' your plasma. That means not watching channels with static images like tickets or logos for more than a couple hours at a time. Also, when viewing 4:3 (standard def) channels, have them fill the whole screen. And on videogames, try to turn off unnecessary HUD images for your games. After the 100-200 hours though, you don't have to be so coddling to it.

If all that sounds too much to bother with, look for the 240Hz LCDs.