I like that Purple Haze "split post" with the flashabou rib. I tie one similar but I like to use Antron or Z-lon for most of my posts. Color doesn't really seem to matter to the fish. I also use mostly natural colors but I'll use the brighter colors in a Dry/dropper situation, kinda like an indicator. Right now I've been tying some BWO biot cripples and using some some dun antron for a shuck and some gray Z-lon as a post/wing. They seem to stand out pretty good as apposed to deer/elk hair as a wing, plus they catch fish