Panasonic ST50 or ET5?

Hi All,

I'm a newbie with this, so please bear with me. I've gotten a lot of help from friends to narrow down my choice of HDTV to 2 Panasonics, the ST50 series and the ET5 series. I get a discount through my job, so the price difference is negligible. There will be a lot of natural light in the room where the TV will be, but no crazy overhead lights or anything like that. I like to watch a lot of sports, and my wife likes to watch some normal daytime/nighttime TV. My question is simple - do I go with the Plasma ST50 or the LED ET5, given the same size (55") and price point.

To your knowledge, is either Plasma or LED supposed to last longer, or retain it's color longer? I'm really looking for anything that can tip the scales one way or another between the ST50 and the ET5.

EDIT: I forgot to mention that I don't really care about the 3D capability, so please focus on 2D.

Thanks for your help!
rkmarx

Thank you for the info, Dierkdr! I will move this to the General category, but I want to keep it here because I'm leaning toward the Plasma and am curious what "plasma people" will tell me about the ST50 compared to the ET5.