Good afternoon, Naturalook. There are definitely a myriad of pros and cons of going over the muscle vs. under the muscle, as well as silicone vs. saline. An experienced, well-trained plastic surgeon would be in the best position to make recommendations for you, based on an in-person physical exam, history, as well as discussion of your goals. In reviewing your photos, it appears that your breasts are fairly low and that there is some elongation. Placing the implants over the muscle in this scenario may give a more "balanced" look, as opposed to under the muscle, and hence a more natural look. However, if you don't have a lot of breast tissue as you mention, then rippling and a sharp outline of the upper implant may be evident, making the result unnatural. Additionally, there may be a higher risk of capsular contracture, aggravated by the above-muscle placement. Further, placement of the implants above the muscle results in less support of the implant with a higher likelihood (and earlier occurrence) of further breast stretch and "sagging." Another long-term consideration of sub-glandular (above the muscle) placement, is the severance of the deep breast blood supply, potential critical with future surgery -- particularly a breast lift. In my opinion, the low profile implant may not give you the enhancement that you might desire. Overall, silicone implants are a little wider and flatter than saline. The low profile really has a more "disc" shape -- it will fill out the entire breast nicely, but just not add enough Oomph :) The moderate or moderate plus will give nice fill with a little better projection and contour. Another aspect of the implants to discuss with your surgeon is the amount of fill within the implant. This varies by implant manufacturer and implant style. Implants with less fill will have some caving in the center, like an ashtray. Additionally, the degree of cohesiveness of the silicone will impact the degree of rippling and firmness of the implant, as well as the degree to which the implant is flattened when placed inside (which affects the degree of projection and upper pole fullness/convexity).Best of luck to you, and I hope you are able to achieve the results you are looking for, should you decide to proceed with a breast augmentation! Dr. Ghafoori