It depends on whether you are using it for normal TV viewing or you are trying to use it for Home theater.
(You state "Just for TV/Screen", which leads me to believe it will be used just for normal TV viewing, however, the sizes you state, leads me to believe it will be used for the a Home Theater setup.
If just for regular TV, I recommend a 3:1 ratio of viewing distance to screen size. (i.e. a 60 inch screen x 3 = 180 inches, or 15 feet, maximum.)
However, if you plan on using it for Home theater, I recommend a 2:1 ratio. (i.e. a 60 inch screen x 2 = 120 inches, or 10 feet, maximum.) Anything greater than a 2:1 ration will diminish the effect you are looking for. (Trust me on this. I have a 46" screen and I use the 3:1 ratio, and while nice for TV, it does not really give me the "Home Theater" effect I was hoping for. I really need a 70 inch TV, as I sit about 12 feet from the screen.)
My two cents worth anyway.
(You state "Just for TV/Screen", which leads me to believe it will be used just for normal TV viewing, however, the sizes you state, leads me to believe it will be used for the a Home Theater setup.
If just for regular TV, I recommend a 3:1 ratio of viewing distance to screen size. (i.e. a 60 inch screen x 3 = 180 inches, or 15 feet, maximum.)
However, if you plan on using it for Home theater, I recommend a 2:1 ratio. (i.e. a 60 inch screen x 2 = 120 inches, or 10 feet, maximum.) Anything greater than a 2:1 ration will diminish the effect you are looking for. (Trust me on this. I have a 46" screen and I use the 3:1 ratio, and while nice for TV, it does not really give me the "Home Theater" effect I was hoping for. I really need a 70 inch TV, as I sit about 12 feet from the screen.)
My two cents worth anyway.