If you want to study CS, the Purdue CIT program is not CS. It is more of an IT major for those who want to manage computers, software, and networks, rather than design and develop them like CS majors commonly do. If your interests are more technical and creative, this type of major is probably the worst fit for you out of your choices.
GT computational media has substantial CS as well as other course work; take a look at the degree requirements to see if it interests you more or less than a typical CS major: Bachelor of Science in Computational Media < Georgia Tech
What is the reason for wanting to add a major in business?
How does cost and debt compare?