I have a curved Samsung in the living room. I think it is 62" (edit... it is 70")
Our living room is 13' x 27' and it is more than large enough. I wouldn't want any larger.
Having said that, I also have an HD projector with an 9 ft screen and surround sound. Freaking awesome to watch movies on.
So... in my opinion, I would go that route. You can get electric hideaway screens so it can be put anywhere.
The only problem is my ceiling height.
At 25 foot would a projection screen work?
You could do a wall mounted screen.... anywhere from $100 if you build your own (I did) up to several thousand $.
Then of course there is the issue of where to put the projector.
I will say, with the expense of an HD projector bulb well into the $100s a piece - it is not meant for daily watching running hours on end.
It is meant for movies and sporting event with friends etc.