I am getting to that stage too with a sativa strain (super lemon haze). It is said to be a 10 to 12 week flowering stage type also.
I am now in the middle of my 6th week with cloudy trichomes (at least 50 percent), but no ambers yet. Stigmas are just starting to turn brown.
I will take a photo tonite. I may be jumping the gun on this one but I dont like brown trichome heads either......... when they start to show I like to harvest, at least under HIDs. So I might cut off their nutes unless people think it is too soon........ it is nice to be at this stage, they have a sweet fragrance, but I dont want to screw it up now!
jus sayin