I have changed my initial color combination of Sliver Grey/Portland Natural Brown. I have seen over the last weeks several Silver Grey E60's on the road and must say that if the car is a little dirty, the color and shades do not come out as nice. Also I have seen PNB now on pictures and find it too light.
So new and final color choice is Silverstone II / Full Black Merino with Aluminium trim. I can't wait till May 25. mmmmmm