To replace Bench Presses or Dumbbell Chest Presses (of any kind), you can do one of these:

Pushups
Close-grip pushups
Decline pushup
Elevated pushups
Off-set pushups
Pushups with your feet on the ball
Pushups with your hands on the ball
Pushups with your feet on the ball and hands on the bench
Suspended strap pushups
Spiderman pushups
Spiderman climb pushups
Pike pushups
Dips
Decline close-grip spiderman pushups