285-320 cc - What size should I get?

Hi, my skin is really bad. My surgeon wants me to get 285–320 cc over-the-muscle teardrop implants. She also wants me to get B-Lite implants. I have a B cup now after significant weight loss and four children, close in age. I had 625 cc implants once and had a terrible experience. That is why she wants me to have a different implant type and teardrop shape. But how do I know what size is right for me? I am 160 cm and 69.9 kg. I don't want them to be too big, but I don't want them to be too small. Help??