I used their matte white with a gain of 1.0 I believe, I think gray will give you better contrast and blacks, but that Panny does a pretty good job as is...the gray might not be as bright, especially in a room that you can't control the light.
M80s-VP180-QS8s-EP600-2xEP350 Denon3808 Outlaw7700
(M22-OWM22-VP100)-all in storage