I have lots of polish and I never have issues with them. However they are in my fenced in backyard and rarely go out of the fence. My other chickens do not pick on my polish but they (polish) were around before the others. If you want polish, I'd introduce them all together from the very beginning and hopefully you would have no problems. Another pretty one with a crest is the Mottled Houdan. I have one of those too. She's the sweetest thing.
I also thought about getting some Orpingtons but I chose Wyandottes over them for some reason. My Wyandotte eggs will be here next month.