What is the best boob size for an actress?

I'm still young, & I've had a baby. I'm an aspiring actress and I hope after college I can afford to move to Los Angeles. Obviously after you have a baby your body changes. My boobs are currently a size 34 C but how do I put this...their stretchy lol there not firm like they used to be. I wanted to get a boob job and become a firmer, but also NATURAL size B. I want to have sexy breast but not look fake, and also have a good size for acting on film. Does this seem like a good size? Also anyway other way than going under then knife? Thank you!