Believe it or not 7 and 10 is a big difference with tvs. 60 sounds about right though.
To further clarify the usual recommended distance is between 1.5 and 3 times the size of the tv. I might would go with a 50 for your distance. I usually go to best buy and look at the sizes to try and judge.
This post was edited on 1/21 at 7:14 pm