OMG. After reading all the responders' comments to your question of tummy tuck vs. umbilical float, I am totally confused, and I have done hundreds and hundreds of tummy tucks and a handful of umbilical floats myself. I disagree with the surgeons who say umbilical float is not a good operation and that you don't get a normal belly button. I have done it several times in very unique situations with positive and attractive results. That having been said, I personally think you could have a full on tummy tuck.
There, I have done it. I have added to the confusion. Here is my suggestion. Of all the Board Certified surgeons you have seen, who do you feel the most comfortable with, who has the best before and after pictures, who has given you the name of several of his patients and you have talked with them about their experience with his or her tummy tucks. To me, that is the answer. You don't want to pick the technique, you want to pick the surgeon.
You are going to trust this plastic surgeon with your life and your looks. Don't limit them as to what they can do for you. I love the internet. It has educated not only patients, but also surgeons. The problem is, there is so much information out there that patients are now making surgeons decisions.
You pick the surgeon, let the surgeon make the surgeon's decisions.