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
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).