I too have read the results on silver. I have only experimented with silver fabric an the results were 'unwatchable'. My silver experiment did nothing to enhance black level detail, produced sparklies, enhanced the screen door effect, and magnified DVD artifacts. I obviously tested the 'wrong' silver.
Flat white matte is the easiest to work with and color correct for. However, it's this new gray finish I'm most excited about. I do have to adjust for the loss of color saturation and whites are slightly compressed. This new gray has four significant advantages: Reduces visable artifacts, deminishes the screen door effect, enhances the blacks and controls the amount of light reflected into my room and back on to the screen.
In the white vs gray vs silver war, so far it's the gray that delivers the most satisfying viewing experience for me. Other projectors in other environments may produce completely different results.
When viewing 2.35 to 1 dvds the 100" vs 80" screen at 12 feet does indeed have impact.