What an awesome collection, I couldn't believe it when I scrolled through them! I've never even seen that style of full sus cannondale, or the trek for that matter. Your Pace is of course a thing of beauty.
The silver frame RTS with the curved gt plate at the back should be post 95/96, whereas the black RTS with the flat plate must be before this date, as I understand it this defined early US/ late taiwan manufactured frames.