I'm afraid I'm not aware of a silencer for metal needles..sorry, they all seem to click. I will have to say that the fastest for me are knitpicks new Options needles. Then, there are the famous Addi Turbos. Both are metal with a nickle (it is nickle, isn't it?!) coating which makes them very slick, very fast.
Addicted to the Knit is Becka
"I can do everything through Him who gives me strength."