If I don't have a source that is 1080p (i.e. blu-ray player) but only have sources that are 720p (xbox 360, over the air HD signal, etc...) would it truly be advantageous to get a 1080p TV over a 720p? Next question, I know that if you hook a computer up to it and use it as a monitor the 1080p is best, however is a 720p still usable for that? (is the only difference it will be at a lower resolution?) Thanks. Edit* tv will be 37-42"