Thanks for that info, Paths. Still undecided on a Projector. We have an old 800x600 data projector we'll probably use for the moment. I've used it indoors on a 100" screen and it did OK. There is a somebody's W500 projector out now getting good reviews. Everytime I brouse the "under $3000 projector" forum I change my mind on what to get. Very confusing!
I did realize the deck setup of the screen is fairly quick. It's the setup of the projector, receiver, DVD and speakers that take me some time. My deck is big, but parties usually roam the whole thing. Movie time would mean moving tables and chairs, setting up the projector in the middle of the deck, and so on.
Right now I'm looking at the assorted Popcorn carts out there and may just make it a Popcorn-and-a-movie night, with everything set up when guests arrive.