KBman - You mentioned PPeople had Sony with 2500:1 contrast ratio.
Allow me to discuss a bit about contrast ratio of projectors in actual use. Home theater users strongly prefer excellent contrast ratio as JVC products have become famous for.
Unlike home theater, public theaters generally have insurance coverage, and insurance folks want lights along the floor and along steps. They don't want to deal with audience injuries. These safety lights constitute ambient light that to some extent destroys constrast ratio.
Some measurements in commercial theaters indicated 1000:1 as the limit of contrast ratio capability. These studies were performed 15 years ago and may be outdated. Assuming theater condition have not improved all that much, a projector with 2500:1 contrast ratio is worth a try.
Before trying a projector, find a theater and reserve time schedule to try the projector in actual working conditions. Floor and step lights on. Exit indicator lights on. How does the picture look with ambient lights? Looks pretty good? Not as good as your RS20?
For the audience, the primary thing is the story. After the story, the major value is brightness. Locked into the story and totally distracted by it, they might not notice the color seems not quite accurate and the contrast ratio sucks. Good luck!