You may want to look at some of the Kuhl offerings. I've heard their synthetics are similar to Kuiu/Sitka... never compared them myself personally. I do know that Kuhl makes a good product though. Just out of curiousity.... why a solid color requirement?
I have a couple pair of the Kuhl pants and to be honest I don't care for them. The material is not very stretchy and I just don't care for the cut and fit. The Traverse pants from 511 is a great choice, I have both them and Attack pants and they are very similar, fast drying and great 4 way stretch fabric, which helps when climbing. Only 511 traverse are not cotton based, their other pants are cotton blends and not really suited for mountain hunting.