Originally Posted by bigfan9999
How far are you seated from the 58pz700? I am deciding between the 50 and the 58. Also, does the 58 overly dominate the room (your expectations vs reality)?
I went through the same decision and ended up with the 58/750U. Couldn't be happier; it's a gorgeous machine, especially with well-mastered Blu-ray discs on the PS3.
If your room, and budget, can accommodate either size I'd recommend doing what I did: make a paper mockup. I got a 4-foot contractor's level and hung my paper doll from one edge - then laid the level on top of my old 27" CRT. (You don't have to use a level; it was just close by and I'm lazy. A 2x4 or other object that's wide enough to hold the paper doll will do.) That way the new paper screen was in the same location as the existing TV.
Make a paper mockup (just tape together sheets of white printer paper or something; I think newsprint would be too distracting) of the 58" and then use a Sharpie marker to outline the 50" dimensions inside the mockup. I recommend putting the smaller one at the upper-left corner of the bigger one rather than centered - it makes the size difference more obvious.
It doesn't sound like it at first, but the extra 8 inches diagonal adds 34% to the total screen area, and that makes a HUGE difference - I figured it out and made my decision in about 10 seconds once I set it up. YMMV, though.
Here's the screen dimensions; note, these are NOT the overall cabinet dimensions, but are the important ones - the actual viewable area:
50" -- 24.5" x 43.5"
58" -- 28.5" x 50.25"
and if you want to go nuts . . . .
65" -- 31.9" x 56.7"