I'm 180 and 5'8 is 700cc Too Big?

Thank you for your post. Bigger breast implants are associated with higher complications, especially long-term. Some of these are not reversible once the breast tissue has atrophied and stretched. You should talk about this more carefully with your surgeon. Be sure that you seek the advice of a board certified plastic surgeon. Best wishes, Dr. Aldo.

700cc does sound on the large size. Have you tried on sizers to check if it looks good on you? Are you comfortable knowing that there may be a higher risk of complications because of their size (e.g. stretchmarks)? I would recommend seeking a second opinion.

It is difficult to provide advice as no other measurements have been provided. 700cc may work for you, or they may be too big but this depends on your current pre-surgery measurements  I use a technique known as Dimensional Breast Augmentation. This involves taking a variety of measurements of your pre-surgery body, such as your height, breast width, weight, etc. Then, we discuss your goals and with this information, a suitable implant size is selected. Find out if your surgeon does this for you.