Compare what kind of house you can get for $400,000 in six markets across the country. Starting in Portland, Ore., we visit a midcentury modern with an atrium. From there, it's on to Atlanta to check out a new traditional-style home on an acre lot just outside of town, and then to Seattle to see a green-built contemporary tri-level house. Last up is a look at homes in St. Louis, Baltimore and Gainesville, Fla.