Interesting...
I have been doing normal benches since forever, and my pecs, they seem to keep growing, I like inclines but never really see anything in terms of results in the upper area of the chest, maybe it's the angle of attack for my chest sections & connections...heh but!
I just started doing "Incline dumbbell hammer flyes" and I love the growth they can concur, one hell of a stretch and they tear the muscle very very well (very sore next day and or two). I only use 30 lbs for each hand, I recommend trying these for 3-4 weeks, your upper chest will flare up very well.