My suspicious mind would want to be sure that, after a water pump change, one of its connections isn't leaking. If the radiator really is leaking, make them show you where. Not impossible. Valve cover gasket: often a shop will tell you that when there is normal seepage from the oil filler cap. Not critical usually, either way. Both of these parts are easily replaceable by you. The radiator change, if it needs it, is really easy, and good ones are available aftermarket for very reasonable cost. Check your local auto parts store or the excellent sources that advertise here.

Good luck!