Well, do you want to major in economics or CS? All of them should be fine for either CS or economics, but there are some differences between them. Where do you want to work, and in what field?
Be aware that, at Berkeley, L&S CS requires a 3.3 GPA in the prerequisites to declare, and economics requires a 3.0 GPA in the prerequisites to declare.
Berkeley offers a typical-math (single variable calculus) and a high-math (multivariable calculus and linear algebra, recommended if you want to go to PhD study in economics, where more advanced math like real analysis is also recommended) version of intermediate economics courses. Chicago only offers the high-math version. USC only offers the typical-math version.
Net price at each school?