Well if I were in your position, if you have budget constraint, its better to change back to a 50' LCD or plasma.

1. you can watch low resolution program anytime.
2. you can watch it in day light.
3. By now you would probably have realised, great movie picture quality does not mean its worth keeping the movie. Most of the greatest film that make you remember is of lower quality make. How often you can watch an Avatar ?
4. save resources on sound quality, which I think is slightly harder to achieve then picture quality. Even a basic computer Mobo can already achieve almost perfect 1080p PQ.

Just my two cents. No offense to others.