Hello Sophia and thank you for your question. The long story short is that it is NOT a good idea to overfill saline implants to the degree that you are mentioning. You are setting yourself up for a poor result in terms of a very hard feel, high chance for future rupture, implant malposition, and many other problems. I think silicone implants feel better, last longer, and are a better value for your money. The plan you have in place is not a good one and will only lead to your disappointment in the near future, and also cost you lots more money to fix when problems occur. With respect to implant size, I want to start off by telling you what I tell many of my patients: Do not focus on cc's or bra sizes as many women see their friend with "x" number of cc implants etc and think that they have an idea of what they want. There is a lot that goes into implant selection -- your breast volume, the amount of cleavage you want to achieve, your base width, your nipple-to fold distance, whether you have had children before (as the breast tissue tends to be more stretched out), your rib shape/projection, etc. Without seeing you and doing your measurements, it is difficult to assess accurately your final breast size or shape. Please also keep in mind that when it comes to bra sizes, most women are not accurately sized for their bras. Also, not all plastic surgeons measure base width the same. Furthermore, there is not a direct correlation between height/weight and base width; therefore, the base width should be measured as each person is unique. The most important thing to consider is really the size and look that is appealing to YOU with the implants you choose. Many surgeons have sizing models whether using bras with implants or computer simulation. A breast implant is a round object and has a certain diameter. Your base width on each side of your chest will determine "how big of a ball" or what diameter implant you can reliably go up to with a socially acceptable cosmetic outcome. The implant will "augment" or increase the size of your breasts to an amount acceptable to you and your surgeon. My patients will try on a sports bra and then we pick the implants based on their measured breast base width. For example, if your base width were to support up to a 600cc implant, I would have you try on the 600cc implants in the bra and then the 580cc or 550cc implants and afterwards select the implant that made YOU the happiest. In reality, don't stress too much as this is not a HUGE difference and should be the fun part of the process. For your reassurance, I would have you try on the 800 cc implants and so you could see for yourself what they would look like on your body -- most likely you will see that either a) they have no room on your frame and/or b) that they will not look the way you want. My best advice to you is to go with what is acceptable based on your measurements and makes you happiest and make sure to weigh the pros and cons of the options you are considering. You can also compare the moderate profile with high profile implants and see which look you like most. The profile of the implant will determine how much upper pole fullness and overall projection you portray. In my opinion, in a young patient like yourself, high profile implants give the breasts a nice shape for augmentation, but it depends on your preferences. Make sure to seek consultation with a board certified plastic surgeon with expertise in aesthetic breast surgery who has experience with placing larger breast implants. Since you seem uncertain (with good reason) of your current plan, I highly encourage you to get a second opinion. I hope this helps answer your question and I wish the best of luck to you. Sincerely, Dr. Sean Kelishadi