Well I'm a bit dissapointed that you didn't recieve more responses to this one as I'm always curious what patterns other people are using. I don't know that I have one goto fly for steelhead but I use a lot of flies with zonker strips like the bunny leech you described but I like mine in all purple or black and I also like to use chartruese/black and chartuese/hot pink. I'm using spey style flies more and more in basically the same colors, I don't know if they work better but they are just too cool and I just like to tie and fish them. I also like to use flies with a good amount of flash in all but the clearest water.
Turk