A rooster can't protect a flock at night. He's as blind and vulnerable as the hens in the dark. A raccoon has perfect night vision.
A polish rooster isn't much of a protector anyway because of limited vision especially overhead.
IMHO, a Mediterranean breed is an excellent flock protector...
All those American, English and Continental breeds would work where you live. I would probably go for a breed you already have probably and Orp or Rock.
As for other breeds. I like these 2 breed charts to look for personalities and traits...
A rooster is helpful in protecting day time predators, especially hawks. If it's something he can't defeat, he'll give himself up to save the hens.
All roosters aren't aggressive to people. Most protect from predators. That would be something that moves fast, especially from above. When roosters...