Regarding the white vs grey issue... Grey will give you better black levels, white will give you better brightness. You're (unfortunately) going to have to choose which is more important to you. If you have ultimate light control you could probably go with grey. A good friend of mine has an Epson 1080UB (last years 6500UB) with a Carada white (normal one, not the higher gain one) and in total darkness it is definately more than bright enough.