You're going to want to stick with LCD if youre going to be using your HDTV as a computer display. LCDs are much better at holding static images than Plasmas.
You will also want a 1080p display to maximize resolution and allow text to be as crisp as possible. For your situation the
best HDTV will be a Samsung
LN52A650 /
LN52A750 or
Toshiba's 52XV545U. (I believe the Toshiba use's Samsung LCD panel's, but you dont have to suffer through the red touch of color the Samsung's have... unless you like that sort of thing).