For absolute black level and shadow detail I use 'Dark City'. 'Unforgiven' and 'Blade Runner' are good too.
For contrast I use the original Star Wars (ep IV) opening sequence with the type and green logo and then the star destroyer flyover.
For color accuracy I use the opening of 'Fellowship of the Ring'. It shouldn't look too green.
I also use the Moria scenes for shadow detail and gamma setting.
For DLP dithering I use 'Elizabeth', notably the interior scenes about 3/4 through.
Whilst I disagree with his use of screen shots and many of his conclusions, you may wish to check the reviews at www.projectorreviews.com
. Art has his favorite scenes which he uses consistently and which may provide a reference.
The other big fave for fleshtones and resolution here is the Leeloo on the ledge section of 'Fifth Element'.
Given the general flexibility of the color in the film, I guess it is because Milla is a hottie.
Generally I think it is very difficult to tell anything concrete about a projector unless it is in your home, in your room and showing an image you know well.
I wouldn't even bother to view one at a dealer, no matter how well setup (and most are anything but well setup).