I'm picking up a ton of freelance web design/application work, so I want to start a business...?

What is the best entity for freelance web services such as design and app development? I live in Michigan, I'll be operating out of my house (for at least a year), and I'll never hire employees - it's a one-man show. Please list the reasons behind your answers. Thanks a ton! I've been looking at LLC's, Single-Member LLC's, simple DBA's (sole p). I'm confused...