You have an elite. The PQ is incredible compared to 99% of HDTVs. You would likely be better served by some sort of audio upgrade dollar for dollar.
I own a 50" Pioneer Elite which is 4yrs old and hence only gets 720p resolution. The picture is still incredible, especially with Blu Ray (even though it's only 720p). Would it be worth the $$$ to upgrade to a 50" Pioneer Elite 1080p TV, or is the difference in picture not that dramatic. That is of course, assuming that I can even find an Elite, since they are no longer being made. Oh by the way, my viewing distance is 10 ft.