I have to agree with Dble Haul, unless you are fishing extremely spooky fish in crystal clear water, the color of the fly line is not an issue. Atleast that's my experience. With the proper amount of leader on (we use 12-14' for Atlantics) it's no problem. We usually use Maxima chameleon leader, and I do think the type and color leader is important. One advantage to the bright orange and green fly lines is they are easier to see, both in heavy water and low light conditions. So that may be something you may wish to consider. Hope this helps some.