I saw the RS20 in Denver and it was a very nice projector but it's not going to be leaps brighter than the RS1 and RS2. They had it on a 110" screen with a 1.3 gain and the measured screen brightness was 17ftl. Definitely doesn't match the rated output!!
Side note, I don't understand why people get what they believe is the "best", "most accurate" projector then project it on a 1.5 - 2.0 gain screen because it's not bright enough. Doesn't this defeat the purpose?
I'm looking at the IN83 due to this. The setup for this projector sucks though, offset, lens shift. I guess if you can get it to work for your space, get it.
Here's my funny (funny because I can only laugh to keep from crying) story. I want a decent size screen, like yourself 120-130". Isn't this why we want projectors? Well, I looked at the RS1 and RS2's, like yourself. I just couldn't sell myself on the light output being enough, under 16ftl. So, I heard the rumors on the "new" JVC's. Brighter, sharper, new design, sweet!! Went to Denver just for the JVC's. Came home assuming I made my decision on the RS20 but I was impressed with the Marantz projector and demo. They had Transformers playing and it was like a large plasma, sharp, clear, very nice picture just too dim. Then I put pen to paper and analyzed the RS20 for my situation. JVC had the demo in a small, ultra dark booth in the back of a dimly lit room, best case sinario. The numbers didn't match up, I was back in the RS1 and RS2 realm with lamberts, damnit. Now with the IN83 I can have a 150" screen with above 16ftl screen brightness (on a 1.0 gain screen) but I can't get it to fit. The projector has no vertical lens shift and has an offset of 36%. So....I can get a RS20 with a MAX screen size of 120" and change bulbs to keep the brightness at acceptable levels or get the IN83 that can do a 150" screen but I can only manage a 126" (pushing it) for my room dimensions. It's never easy is it?