If you are a firm believer in DOMS, then I shall agree with MAYO, the only upper pec move that gave me DOMS is mid-incline dumbbell flys, however, you must try ever single exercise outlined in the answers here to find out what works best for you! I found out through trial and error, which is why you have so many different replies here, that incline fly's work best for me. I believe 100%, especially when it comes to building 'sections' of muscle, upper pecs in your case, that individual results will widely vary and you must give every exercise it's due.Write down all of the exercises outlined and run them for a month, if an exercise just don't feel right, you will know right away and can x it out.