I feel the best way to a poweful, well defined chest is through bench, incline bench, dips and pushups. I'm not a big fan of isolation moves like fly's or pec-dec etc. They serve as a good way to add that extra "oomph" but in no way should replace your synergystic pushing movements.
Nice triceps? Try skullcrushers, close grip bench and dips. Also try this - if your gym has a foam roller perform a set of close grip pushups using the foam roller; superset these pushups with dumbell kick backs. You're triceps will fry.
Be careful not to incorporate your rear delts into the kick backs though.