I favor turkey t-base feathers. It's very light, comes in lots of different colors (some that are in my desk right now are white, wood duck tan, flo. orange and flo. pink). Believe it or not, the pink ones are far easier to see at dusk and dawn than the florescent orange ones. Another reason I prefer them is that they produce a very uniform wing post.
Give them a try - you'll like them. They're available from a number of sponsors of this board.
-Darryl
My one wish is that when I die my wife doesn't sell my fishing stuff for what I told her I paid for it...