Size is up to you, but personally, if I had gotten a C cup from HRT, I would have opted for the smallest implants necessary to improve appearance, but since I didn't, I chose 500cc silicone implants, which makes me a 36DD; I am happy with them, and they are very soft. Silicone implants are superior in every way to saline, so do your research and choose wisely, even if you have to pay a bit more out of pocket. My implants were placed under the muscle through my armpits; it was a painful recovery, but I don't have visible scars.