I hear that when you're using a TV like that for your computer, it's better to use a HD LCDTV instead of a regular HD Plasma. Something to do with burning in the screen or something.
Plasma's going out. LCDTV is in. OLED is the future. It's up for grabs between Sony, Samsung, or LG as top makers of HD LCDTVs.
This would be the one to get for those who don't want a 40"+ model:
Newegg.com - SAMSUNG 37" 1080p LCD HDTV - LN37A550
That 37" is perfect for most rooms. Probably won't see too much of a differencve between 37" and 40".