I spent literally 100`s of hours reading on here and asking questions...……..many things can seem like a mountain and might not even be noticeable.
The only real way is finding out for yourself, then you will know.
Benq 1070 or 2050...…..very good picture for new projector owner, very reliable projectors.
It might take a small change of plan or some creative solutions, but a spandex screen gives a super nice picture and is able to allow speaker sound to pass, its also super cheap.
There are a bunch of solutions in dealing with a frame screen, you just need to find what works for you...…..
You are right in thinking it needs to be larger,....I would recommend 110-120 as a starter size, after all its called the big screen for a reason.
Plenty of 3-d movies, the easiest is a bluray player, 3-d ones are cheap and easy...…..
I have never used one, but they make HDMI splitters so you can run to the pj and the flat screen and not play with wires all the time.
I did the benq 2050 and started with a on wall screen, then upgraded to the spandex so sound was able to pass thru it...….all my guests are very impressed with it, some of them say they cant believe it looks almost as good as a flat screen.
I paid about 600 hundred for the pj and about 100 bucks for the screen...…
Whatever you decide, I am sure you will have fun, I have been enjoying mine now for 2 years....still makes me smile...…...I am on it now, the flat screen has not been used in the last 2 years....well for a week when I was waiting on my new bulb to arrive......