i agree with ernest. i don't think fly line color matters too much to the fish. I think if they can recognize your fly line, you're probably not gonna catch much anyways. color is more for the angler for low visibility conditions and mending purposes. I personally like drab colored fly lines, but i've fished some rigs with drab colored fly line in low light, and it's not so easy. i would say that a flourescent green or chartruese would me a good compromise.