How to pick the right size or cc? I’m 5’8 and currently 150 pounds. Thinking about 580cc. (photos)

The average volume in the US is 350 cc. So a 580 cc implant may be too large for you. The best way to determine what you would like would be to try on sizers in the office.   Choosing an implant based upon an aesthetic goal that exceeds your anatomic capacity may lead to complications and possible revision.   I think for those people in whom the living is made by athletic performance, the implant can be placed above the muscle.  Other patients will be happier long term with submuscular placement.My patients bring a few garments with them to the exam so that they can actually see how the sizers look under a tight sweater, bathing suit, blouse, work-out tops, and clothes they wear most often. I would recommend that you go with the size that boosts your self-esteem, and fits your anatomy.Consult with a board certified PS who can help you determine the best size for you. 
Kenneth Hughes, MD, ABPS Board Certified Plastic Surgeon
Los Angeles, CA

Patients often think in terms of cup size when considering augmentation. Unfortunately, devices are sized in terms of milliliters (cc) of volume. This can lead to some confusion when sizing. Additionally, it is important to remember that cup size itself is not standardized with variations from one manufacturer to another. Unfortunately, as many women can attest their cup size in an industry leader such as VS is not necessarily transferable to another brand.
Another point which is often under appreciated is that of anatomy and starting point. Any implant will add volume to the volume which is already present. The implant is additive. A particular volume will not necessarily confer the same cup size to different patients (often times it will not even confer the same cup size to different breasts in the same individual...remember they are "sisters" not "twins"). 
A general rule of thumb is that 125cc can represent somewhere between 1/2 to a full cup size increase. Smaller volume differentials (25-50cc) are typically less consequential representing a volume change of less than a shot glass. However, I have found these numbers, at least anecdotally, to be of little help. Patients often present with notions/goals which do not correlate with these sorts of sterile volumetric assessments.
When sizing patients, there are a number of useful tools including:
-3D imaging (has the added benefit of offering a volumetric analysis of the pre-operative breast)
-Breast sizers (rice bags)
-Goal photos
I also recommend that patients commit to a particular look rather than a cup size. Once a patient settles on a look that pleases them the overall cup size increase becomes less relevant.The key to obtaining a natural result is to stay within the parameters defined by your BWD. 
As always, discuss your concerns with a board certified plastic surgeon (ABPS).