To be truthful, it is a hazard to guess about this as so many factors come into play. Not least of which is the fact that different bra's may size you differently!Having said that, it is very likely that you will achieve a D cup. I like to size my patients with an actual implant that we are proposing to use. This gives the patient and me an idea of not only size, but of shape, and overall proportion. It is great in that it gives both of us a good sense that we are understanding each other. Perhaps you should give that a try!
As there is not standard in cup sizes, you should experiment. Take a measuring cup -- fill it with 450cc of rice and put it in a baggie or stocking. Place it on your breast and see what size you are. Rule of thumb is that 150 - 200 cc is one cup size - but it depends on your size, if you are 5' tall or 6' the same size implant will look different.