If I move to a house we're considering, it would be in the basement, so light is no issue. But, in my current home, it would be in our living room where we have a bank of south-facing windows on the wall adjacent to where our TV is located, and a west-facing pair of French doors opposite the TV. Lots of daytime light. Would I need the ST or GT version to have it look good in my current living room?
You start to lose black level with even a little ambient light. So if tha'ts important to you, you need the ST/GT.
I'm hoping we'll see better deals on 55" ST/GT, it's hard to justify a $400 premium over the UT50.