Nice set up. I was looking at the 70" Vizio at Walmart last night, it's definitely not out of the question but I was trying not to spend over $1500. We watch Netflix, hi def mp4/mkv movies, and I play xbox 360 occasionally, we don't even have basic cable. Plasma isn't an option because of windows; we have 2 skylights on the back ceiling and big cathedral windows on the side. Don't care about 3D or big surround system, I was planning on getting the Vizio VHT215 soundbar.
What you see in the picture is 12' back which is obviously too far for the current set up but it was temporary, so I would do 9'-12' with a 65" tv.
It's good to know that I can go up to 70" if I decide to spend a little more, thanks for the info guys.