[Golden Eagle]

With a room that big, I’d suggest a projector on the far wall, and a 40-46 1080P screen directly in front of you.

[Varda]

Ditto on the projector in a room that large. I own several nice panels but nothing beats a projector for bang for the buck. The one below goes on sale for under $700 every once in awhile and weighs about 3lbs. I made my own screen for $100 or you can project onto a wall.

LG PF1500 Full HD Portable LED Smart TV Home Theater Projector with Magic Remote