[MRM]

Don't change. If you are wearing a suit and tie, you want to look professional and you should wear a white shirt. IBM was successful with their business uniform of white shirt, red tie and blue or gray suit for a reason. It's what looks most professional.

Blue shirts are less formal and professional. I save them for specific suits that go well with brown shoes and brown belt. I'm old fashioned so I think you should wear a white shirt with a suit. Usually I limit anything but white shirts to days when I wear a sport coats with no tie. I consider that more business casual and any nice dress shirt will do. I have the white dress shirt collection to rival Tabs' shoe collection.