I've been studying, comparing and looking at (in Circuit City, Costco and Best Buy) a lot about the TV monitor to put in my room. The wall to wall is 15 feet and I think 50 inch or 56 inch is the best size for it.
DLP pros: reasonably cheap for a large size. 1080p available. Good for gaming and PC output
DLP cons: Narrow viewable area (Need to sit straight front), Gigantic (No stylish)
Plasma pros: beautiful screen. Wide viewable area. Flat and doesn't take that much space (depth).
Plasma cons: More expensive if bigger than 42". 1080p is not available (Some models accept it). No good for gaming.
My sources for the monitors will be: DVD and ripped DivX/Xvid files (~720x 480), Location Free TV (320x240) and p2p football programs (i don't know the resolution but they're very small). I'll probably buy either Wii or Xbox 360 for gaming if I have a spare time, but won't play that much. I might subscribe to DirecTV or Comcast for some HD programming if they're available < $60/month.
So, I don't stick with 1080p at this moment, but having a future compatibility is good. Apparently leaders in this indusry are Panasonic (Plasma), SHARP (LCD), Samsung (Plasma/DLP) and Toshiba (DLP). Samsung's DLP is black and the rear design is made very sharp so that you don't feel that deep, by the look of it.