Mentor 750 & 700cc, have you regretted going bigger?

I am so excited to finally commit to getting my breasts done. After having one child and breastfeeding years ago, my breasts aren't what they used to be. I have been to several consults and have chosen Dr. Aaron Smith in Colorado Springs. He is so very professional and knowledgeable. I felt very comfortable with him and discussing everything surrounding this procedure. My pre-op visit was a few days ago and I went into it thinking of an implant size around 550cc but when I tried them on, i couldn't see that big of a difference. The nurse said "hold on, let me go get the bigger implants" and brought in Mentor 750 & 700cc. Wow! Those made a difference. I immediately knew those were the ones but now I'm having doubts. The heavier the implant and higher the profile, the greater risk for complications and issues down the road. I'm caught between wanting that certain look of upper pole fullness and large full boobs and being terrified of the unknown. I know the risk of nipple necrosis is higher and Dr. Smith explained he may have to use a smaller implant during surgery if I have any signs of compromised blood flow to my nipple and that is all fine & good because I definitely don't want to lose one. I do trust he will do the right thing when the time comes. Is anyone else out there having this same predicament deciding to go larger or have you already had this done with larger implants and regretted going bigger?