Hey all, I am trying to make a decision on what my next nikon flash will be. I am thinking of getting a single sb-r200 and just use it either by hand for tricky lighting, portraits, and of coarse macro. Or to get another sb-600 (I have a sb-600 and 2 sb-900). Has anyone used the sb-r200 handheld before? If so, is it a useful tool?