You need to see the TVs for yourself, and in a good viewing environment. In my neck of the woods Paul's TV has pretty good display areas.
The 92 is very light sensitive, and works best in light controlled rooms. It is also very sensitive in terms of off axis viewing, particularly vertically.
For me the 73 inch Mits DLP is best in terms of brightness, and evenness of illumination across the screen. But that doesn't sound like the jump up that you want. The 82 inch, properly set up, also looked pretty good to me the times I've seen it. The 92 inch, though dramatic in size, and interestingly, quite sharp, has the shortcomings I've already mentioned.
Although I'm not currently an LCD man, the 80 inch Sharp Aquos is not horribly priced (though more expensive than the DLPs), also is fairly dramatic in size, has very good blacks, and incredible brightness, the latter being very important for 3-D if you're so inclined.
But I firmly believe that there is no theoretical answer to your question, only one based on your own eyes.