TweetSuperset incline db's with incline flies and let me know what you think. That's been a great combo for me.
With flies alone, I prefer doing them in the cable cross over because once you get the db's over your body you are no longer fighting gravity with your pecs, you are just hold them up above you with your delts (for the most part). You certainly are NOT using the contraction of the pecs at the top of the movement. With the incline bench in teh cable cross over, even at the very top, the pecs are doing the same amount of work as at the bottom because the resistance is now on a horizontal plane as opposed to a verticle plane.