Right now I am useing the D200 on camera flash to fire an SB-600 but find that this is not as reliable as I would like. I am planning on getting another SB-600 and some umbrellas. Can anyone explain some about useing something like the pocket wizard? Would I need one on the camera and than it would fire the SB-600's or would I need something attached to the SB-600's as well? I am looking for more range and reliability when useing off camera flashes so...?