460cc or 500cc Silicone?

Without examining you, it is hard to say what the appropriate size would be for you.  The difference between the two implants is pretty small - essentially four tablespoons.  However, in someone who is 5'1, either one of those implants is going to be a fair amount of volume.  I would check with your surgeon and see what direction they feel is best for you.

Thank you for the question.
 Online consultants will not be able to, with any degree of accuracy, advise you when it comes to specific breast implant size/profile that will best meet your goals. Your best bet is to communicate your goals clearly with your plastic surgeon. Show him/her what you are trying to achieve with the help of goal pictures.  It will also be helpful for you to demonstrate what you are referring to when you say "fuller" or “ridiculous”, while standing in front of a full-length mirror.

I would also suggest that you not base your communication on achieving a specific cup size;  as you know, cup sizes will vary from one bra manufacturer to another and therefore this type of communication can be a source of confusion.
 

I would also suggest that you allow your plastic surgeon to choose the best breast implant size/profile for you ( hopefully after the use of intraoperative sizers). I find that this careful communication and intraoperative use of sizers ( along with careful measurements)  are important steps in helping achieve patient's goals as consistently as possible. 

 Sometimes, the size of breast implant that can be used safely will be limited,  when breast lifting is done at the same time.
 

Best wishes with your upcoming procedure.