design company logo, letterhead, and visiting card

I'm looking to get a professionally designed logo, letterhead, and visiting card for an established business. Though I do not have any specific design elements or colors in mind, I do want the final product to be of the highest quality. The file formats I require are JPEG, PNG, and PDF. Please provide your best design suggestions and help us achieve an impressive logo, letterhead, and visiting card that will help our business stand out from the crowd.