" The company recommended bronze but I'm afraid it will look brown in certain areas. "

Bronze is a dark brown, What color is the roof? What manufacturer are you looking at? Do they offer any other colors (like something closer to an darkish gray)?

The roof is the same as the driveway but that will eventually be replaced to dark gray.

Black or if available a charcoal of coure bronze is brown so not a choice IMO.

I would not do black for a Mediterranean style house and a house in FL. The bronze/brown windows will limit your future color choices, which isn't a problem if you always plan to have an off white or beige house.

If you are going with a dark gray driveway (why?) then stick with white for the windows. The white will also give you flexibility to paint the house in a wider range of colors in the future.

Don't try to turn your faux Mediterranean into a "modern farmhouse"!

Again, you only answered part of my question:

"What manufacturer are you looking at? Do they offer any other colors (like something closer to an darkish gray)?"