Here are the top five web design companies in Dallas that are known for their quality work and positive reputation:

1. Magic Logix
2. Agency Creative
3. Thrive Internet Marketing Agency
4. Saibbyweb
5. JSL Marketing and Web Design

It's always a good idea to do your research and compare multiple web design companies before making a decision. You should consider factors such as portfolio, customer reviews, pricing, and the company's experience with your specific industry or niche.