The icon is on the right track. My one concern with it is how the "S" created by the negative space looks a little "bubbly" or round. If there's a way to create a mature, serious-looking "s" (if that makes any sense at all...) with the same idea, I'd be very interested in seeing it.
YOu might notice at this point that other designers will start copying the type and icon of whatever you have ranked first, so I have tried to give you some variety.