Well first off, you say you're going to buy a plasma TV, then you say it's an LCD.
They're different and it's a pretty big difference.
Second, Definitely go with an LCD TV because on a plasma tv the image can be 'burned' into the screen if you're playing a video game and it has a stationary health bar or HUD.
Either way it will definitely boost your gaming enjoyment.
Please provide links so we can help you out.