This has been slowly become my favorite dropper rig top-fly. Tie it in colors to match whatever works best for your area. Floats like a cork, and it fishes well as a stand-alone fly also. All I tie these days are tungstens when I'm tying beadheads. Nothing huge for here mind you...max #12. But it floats them all just fine.

http://home.comcast.net/~rlonghunter/FBC.pdf

Ralph