I'm torn too. I can get a 65ST30 for the same price as I can the 55ST50. My room is not all that bright, no direct sunlight will be hitting it, plus, I'm going to mount it on a full swivel mount. My room isn't DARK, but it's definitely not "bright".
I'm pleased as punch with my 30" Wide Screen Samsung CRT HD TV that is ancient, just too small. So, I'm thinking anything will be an improvement.
I want Plasma because of the viewing angle issue, and will be sitting in a radius of 8-11 ft from it dead center on a sectional. So a 55" is just big enough, but a 65 will be as well.
I saw the ST50 side by side w/ a new Samsung LED at Best Buy, and it did look much darker, but the 3D was oustanding. All of the LED's were brighter, and would be.
I'll be using it to watch HDTV via Comcast, BR Movies, and playing Xbox.
10" same price. What to do!?
I just can't decide!!