For anyone with a large screen, I've spent a few hours attempting to find the brightest color settings that don't cause problems elsewhere.
User Gamma: Sports 10/10/5
Color Temp.: Medium
Input Level: Normal
Some of this merits explaining. Sports gamma is the brightest of the three available gamma curves. Unlike the same mode on other projectors, it has very little green push. It's also good about adding definition to the blacks without messing with the black point. I compensated for the green with a slight tint adjustment.
Contrast sets the white point, in theory. Most of my tweaking was in the interaction between this control, BrilliantColor, and the input level. All three clip the white point in different ways. Input level does it in a neutral way at RGB 235 or so. Contrast starts neutral, but will cause a green push at higher settings.
BC is an enigma. On a gradient chart, it has no effects on pure R, G, or B, but brightens and clips other colors, including whites on a grayscale gradient. It only makes sense to have it enabled with the 'Enhanced' input level; with 'Normal' input, you'll seen posterization (banding) on the bright side of a gradient. You can fix the banding by dropping the contrast control to -12 or so, but then you lose the additional brightness.
For movies, my best results were clipping the input levels with 'Normal,' but then bringing up the blacks with Brightness so that pure black in a movie was mapped to pure black on the projector. That setting was ultimately 5. When I had Enhanced input with BC on, I ended up at -25. The results were similar, but the first way is less of a tug-o-war on the tone curve.
Anyway, on my 160" Designer White screen, the above settings result in a very bright picture, no banding, neutral contrast, and fairly accurate colors. I'm very pleased with it for movies. Windows itself benefits from less aggressive gamma, so that's a different preset.