I see exactly what you mean. A larger TV would require wall-mounting and a projector screen would be wall mounted--both would be WAY too high for comfortable viewing--especially of a 2 hour movie. On another note, did you ever get around to ripping the entire Bleach series? 300 Episodes is a heck ot a lot, and I lose patience naming the files just for Game of Thrones, which are 10 episodes per season.
As you see without a total reorg of the room, a much bigger screen would be tough. So I will probably stay with my current TV and just get immersed in my sound. My only upgrade wound be a 50in though. A friend of mine has a 58in and he sits about as far back as I do and it looks really big. But he has an open room and more space. In my enclosed room, with the lights out, a 50in would look really big.