> Which aspect ratio screen to buy?
Use a 16:9 screen with your NEC XG135LC. This way the highest resolution sources (HDTV and 1.78 & 1.85 DVDs) will have the most real estate to display their image. And the slightly lower rez 2.35 DVDs and considerably lower rez 4:3 NTSC sources will be slightly smaller on the 16:9 screen.
------------------DManThe Academy Home Theater
I believe that there is much wisdom in the compromised 1.78:1 aspect ratio since it really seems to allow the greatest use of screen for the maximum number of movies. And it also is the HD ratio.