Screw the plasmas, go with LCD or DLP. Plasmas dont last very long, and they will get messed up if you turn them on their side. My friend has a 63" DLP widescreen and the picture is superb on the HD channels.
My house:
13" Workout room
21" Brother 1 Room
21" Brother 2 Room
25" My room
22" LCD Kitchen
35" Parents Room
52" Living Room