Hi there, iamprego. I am also pregnant with my first baby, so I can really relate to your feelings. All the choices can seem quite overwhelming!
That said, I wanted to chime in about the risks of c-section, even for a mom and baby that have some risk factors associated with vaginal delivery (like macrosomia). I REALLY don't mean to scare you with this, just to help you to be informed. My dear cousin delivered her son via c-sec because of high blood pressure, and he ended up in the NICU for 5 days due to fluid in his lungs. The staff told her that this scenario is not that unusual for c-sec babies, because they don't get squeezed thru the birth canal. I was actually rather impressed that they admitted that the c-sec was (at least partly) to blame. I have also read in several sources that a trial of labor, even if it is followed by a c-sec, is much healthier for the baby, in general.
I cannot agree more with the recommendation to read Henci Goer's book, "Thinking Woman's Guide to a Better Birth". It is awesome! As a pretty left-brained engineer, I tend to want to see the data, the proof. Henci Goer does exhaustive research of medical studies, and boils it down for you without inserting too much of her own bias. I have referred to my copy many times since I finished reading it early in my pregnancy.
Good luck with your decision, and keep growing that heathy baby!
Blessings to both of you,