ISE or CS?

After looking at the requirements to become an engineer, CS is slightly more difficult to get into because of the GPA and class requirement. However, I really just need Chem and Enge! I'm so confused! Which one should I do? I am thinking, though, that maybe it would be interesting to do ISE here as an undergrad, then do HCI as a grad student. I've heard that the Human Factors program is good.