Contrast ratio, or perceived contrast ratio is a function of room lighting. The 10K version is for high ambient light environments. To make a unit for theatrical conditions on screens up to 16' wide, (max for 99% of residential) you only need about 3000 lumens, but very good contrast.
Also, the world has to start looking at ANSI CR once again, because sequential is not very useful. Companies are reporting 500,000:1 CR. Really? At any given point in time, the human eye can only see about 1000:1 CR. (inter scene). What we want are excellent black levels and great gray ramp performance. You don't always get that just because you have great CR specs.
Color gamut is a function of illumination type and luminance maximization. Phosphor laser projectors can do wider color gamut, but at the expense of light output. NEC's Laser hybrid will do DCI color but at roughly 6000 lumens. Lamp based projectors can't really get much beyond DCI and cannot reach SMPTE 20-20. Take a look at the Sony 4K and switch from Rec 709 to DCI and watch the light output drop to half and you will see what I mean.