Left: 470 right: 450. Too big or just right?

Your implant sizes that you mentioned are indeed fairly large for your frame and I find that doing sizing with implants placed in a bra works very well for women with very little tissue, but can be inaccurate in women who have as much tissue as you do. Personally, I would recommend that you find a surgeon who will use intraoperative sizing to pick the best implant size within a range that you determine beforehand with your surgeon. I like patients to bring in pictures of their ideal breast, preferably pictures of someone who is close to their size and shape.Going too large is very difficult to correct. It is always easier to increase the implant size later if you wish to go larger. 

...then they probably are. Being made larger than you wish is a bell you cannot unring, unless you have revision surgery. Ending up slightly smaller than you expected can always be enhanced with the right bra, etc. To be honest, for your dimensions, the implants you have selected are indeed fairly large. Form the standpoint of aesthetics, it's hard to "argue" with what you like. From your photos, you need to probably have at least a dual plane augmentation to achieve the proper degree of lift. Continue the discussions with your plastic surgeon. If in doubt, consider a second opinion. Best of luck to you. 

Good morning!I think the sizers are the best way for you to get an idea what you will look like, and they usually don't lie! I think based on your current and goal photos that you're right on target for an awesome augmentation!

Thank you for sharing your question and photographs.  If your surgeon has measured your chest and assured you that the implants will physically fit, and you like the look when you try on sizers, I would feel confident in your choice moving forward.  Always wise to have extensive conversation with your surgeon to ensure you both are on the same page about your outcome.  Hope this helps.

Thanks for your question and the photos. Picking an implant size is perhaps the most anxiety provoking part of augmantetion surgery.  I find it helpful to allow my opatients to try on actual implants in a testing bra in front of a full length miror.
We focus on the balance of the curve of the breast with the curve of the hips and once we like the implants width we then look at different projections - high, moderate, low. 
I also find it helpful for patients to look with their own clothing- blouses, shirts and dresses.
Given your height the implants you are looking at are generous for your frame, but it is about your goals as well. High profile makes a statement- moderate can be dressed up or down. See if your PS can have you try on sizers to give you a sense of comfort.
I have included sizing faq in the link as well.
Best wishes.

Dear  danielerusek,
breast implant type and sizing selection is a complicated process and requires a detailed consultation that includes a discussion of your goals, a detailed examination, and a lengthy discussion. But the decision will always start and end with the patient. When it comes to sizing, we have all of our patients find 3 photos of their desired breast size. We ask for naked breast photos because clothing can obscure the true size (push up bras). Next, we consult with patients and go over the photos and take detailed breast measurements during a physical exam. Next, we using a sizing algorithm to determine a range of implants that will work based on the exam and the measurements.Lastly, during the operation, we use silicone sizers in the operating room to see how the size actually looks in the breast. We sit the patient up in the operating room, while asleep of course, and compare the sizer result with their desired look photos. If it is too small, we start the process over with a slightly larger implant. We don't stop until we get the perfect match.Of all of my breast augmentation patients, every one of them has been happy with their size due to this detailed and meticulous process. You don't want to invest time and money into a result that is either too big or too small.You should discuss your concerns with a board-certified plastic surgeon and make sure that your surgeon understands your goals.
Daniel Barrett, MD
Certified, American Board of Plastic Surgery
Member, American Society of Plastic Surgery
Member, American Society of Aesthetic Plastic Surgery

Based on your frame, you have chosen large implants that may feel heavy and tend to sag over time. I would suggest going back and trying on sizes a little smaller that will fit you better. Long term, you will have better results with somewhat smaller implants.

Although I do not have the benefit of an in-person exam, 470cc high profile implants are too large based on your height, weight, overall frame and breast width. An implant that is too large for your body may also feel too heavy and more importantly, you will have an increased risk that the supporting structures in your breasts will stretch and you will have premature sagging and "bottoming out" of the implants. Before you make a final decision, get a consultation with a board certified plastic surgeon who uses tissue-based planning, in which measurements of your body and breasts are used to select a range of appropriate implant sizes with the least amount of risk. Good luck.