here's how i like it:
3 parts coffee to one part milk (i usually brew half-caffeinated.)
sweeten to taste before refrigerating (i've been using torani syrup purchased at sam's)
my newest twist on this is to make a tray of coffee ice cubes every morning too. one 10 oz. mug fills up one tray and it prevents the watered down taste that most iced drinks have after a few minutes in the hot sun.