Assuming all three are within your sizing limits -- and I get the impression you know your stuff -- the pink one is in the middle of that range as well. No-brainer here. Pink Colnago for the win.
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A race bike in any era is a highly personal choice that at its "best" balances the requirements of fit, weight, handling, durability and cost tempered by the willingness to toss it and oneself down the pavement at considerable speed. ~Bandera