I have totally stopped watching movies on my Pioneer plasma over my 34" superwide Dell for a couple of reasons
1) annoying neighbours always complaining about the volume, even during "sociable" hours - and thats at less than 20% volume on my amp (not particlarly high at all)
2) strangely enough any bars I do come across on BR rips Completely disappear at night, and so I dont see the edge of the screen or top/bottom , just the edge or bottom of the image (unfortunately not true any more with my plasma)
(obviously I also sit a lot closer to a monitor, so the image appears bigger also - a 34" monitor from 2-3 feet appears much larger than a 50" plasma from 8ft away