I sit 15' away from a 159" 16:9 screen. This is 376% the display size of the 82" display. It also represents a 42 degree viewing angle. The THX rec is 36 degrees, but that rec is for 16:9 AR. Most of my movies are in "wider" aspects.
Everyone I've ever asked says they would not change a thing. This includes a director of 10 years, just inducted into the DGA last year.
Last night I watched Quantum of Solace with a good friend. He says he is going to bring over a friend who is a movie producer, because he is sure that this friend will be blown away.
I might be the only person here that fired up the pic at the blank wall for an entire week to find the ideal display size. I predicted* 120", but after 7+ days, I knew bigger would be better. The only downside, and it's a big one, is the poorer center speaker placement, since I don't use an AT screen.
I would submit that 99.9% of folks have no idea how incredible the pic is from a mid-level projector. Mine is already twice superceded, had for $3k, and is the most beautiful pic anyone I know has ever seen. It wasn't even the high-end unit, and I can't imagine how good it really can get.
Sorry about the hijack. Just wanted to give anyone a nudge, if sitting on the fence.