those early cannondales are great bikes. especially with the steel forks. i had a '90 criterium edition with an aluminum fork. super fast but could never get comfortable with it. if i ever come across one of an earlier vintage with the stock steel fork i will snatch it up without a second thought.
also you mentioned liking a tight cockpit- cannondale's 58 is probably more like a 56 top tube i believe. have you measured it?