Just about a year ago I was in the same situation.

I ran across an blurb on line from some publishing organization that was quoting a couple of sources on viewing distances.

Bottom line: (as I recall, I think) THX certified theaters specs list about 10.5 ft from a 65" screen to equal the viewing angle of the rear seats in a standard movie theater.

I also was looking closely at the Sony 60" But the Wife insisted that bigger is better




...we got the 65" and now we are both smiling