I want to know what cc will take me from a 34b to a 34dd? (Photos)

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.With regards to your specific question, there is very little that can be said without an in-person exam/consultation. Your board certified plastic surgeon is uniquely qualified to guide your decision making process taking into consideration your goals and expectations as well as the unique anatomic measures/qualities that define you (breast width, native breast tissue, skin elasticity etc.)
As always, discuss your concerns with a board certified plastic surgeon.

Thank you for your question.  As you mentioned, there are many factors that come into play when determining implant size. Generally, the most important factors are the width of the implant, and the projection that you are looking for.  These factors are generally determined by taking measurements of you're present breast, and then determining which implant is right for you.  The actual amount of cc can vary depending on what shape you are looking for.  
Looking at the pictures of you're "dream boobs", most of those appear to be of reasonable width, and most likely a higher projection, which is what helps with giving the roundness on top.  Looking at your picture, you have a very nice figure, but you would need to have a breast exam without a bra on to see how much breast tissue of your own you have, and then determine exactly what implant would achieve the results you are looking for. 
As a ball park, most of the pictures you have displayed are at least 600 c plus.  I would recommend having a good examination by a board certified plastic surgeon to explain to all of the factors that, come into play to achieve the results that you are looking for.  Best of luck.