I was deciding between those two sets about 3 weeks ago, and I went with the LN52A550. They both were very nice in the store, and I thought about the plasma for less motion blur, but decided in the end to go for the LCD. I have a PS3 hooked up to it, and watch a lot of sports with constant score bars across the top, or shows with black bars, and some concerns about image retention. I also think plasmas are better suited for a dark room, which isn't a problem as the TV is my basement with no windows, but if I have people over to watch football and stuff, I don't want to sit in the dark to have the best picture. I have bright halogen recessed lighting, and figured the lcd with a matte screen would be better for no reflections, and a brighter image.