Seeming as we're talking pecs and bench here, ill tell what ive been doing. I start with flyes (4 sets, flat) then incline flyes (4 sets), then i do dumbbell bench (flat then incline). It is AWESOME. At first i thought i wouldn't be able to press as much weight, but im still doing just as much, and it feels like im totally just working pecs, delts don't even get sore or tired anymore. Seriously, give it a go.