I would stick to either BB or DB for a given movement, doing both might trigger your body to perceive overtraining.
My current chest workout is:
4 x Flat BB bench press
4 x Incline DB press4 x Decline BB press
3 x Flat flies, incline flies or pec deck
3 x chest prominant dips
This has worked for me as my base chest workout, although i do change my routine every few weeks. This is still the foundation of my chest training and i think (as well as most others) that my chest is one of my better muscle groups, legs are the other but not everyone sees that (only the few lucky ladies.)
