Find a ceramic tint film. metal films are obsolete now. Ceramic films block more heat than metallic, and they also block less radio/cell phone signals.
My suggestion, as a fellow Floridian, is to get a 35% tint film. This will be dark enough to give some nice heat rejection, while not so dark that you cannot see through the windows from outside. Personally, my cars are tinted darker than 35%, but you mentioned liking the untinted look so that's why I mention the 35%.
And since your car is white, I would suggest a tint with a black or grey color.
Find a reputable installer who offers a lifetime guarantee.
Ceramic tint is more expensive than metallic films, but I assure you they're worth it.