Screen burns is not an issue. I've owned a plasma TV for more than 4 years now. I've tried to produce screen burns with static images with bright parts, but after 48 hours there was hardly anything. You might see something for 3 seconds, but after those 3 seconds its gone forever.
And the resolution thing is bullshit, when it comes to sharpness on video, high refresh rate is everything.
I may seem unlogical, however my 1024x768 plasma has sharper image when it comes to videoes than a 1080P LCD. This is because of the high refresh rate and that plasma has subpixels.
LCD is sharper when it comes to still images, but I still wouldn't show my DLSR images on a LCD TV because the huge lack of colors and contrast.
I think you should go and buy a plasma just to try yourself!