“I think some of my friends and family already automatically assume I will (or should) choose Cornell because it is an Ivy.”
Bowdoin and Wellesley college are just as prestigious as Cornell. These are all great schools. I would ignore what might or might not impress friends and family. You are choosing from three of the top schools in the world. From an academic point of view they will all be tough and they will all provide an excellent education.
“I think the smaller LAC is more of a fit for me,”
We toured Bowdoin twice (once on an official tour, once we just walked around). It is a great school. I have a daughter currently attending a different small school and I am very impressed by the quality of the education that a small school can give. You will have smaller classes than at a larger university, and you will get the opportunity to get to know your professors. You will not need to compete with graduate students for the opportunities to help on research.
I would try to minimize debt. If you prefer Bowdoin and with its being the least expensive I would think that it is a very good choice.