However, I've recently been considering a Computer Science BS and a Computer Science and Statistics Joint Masters.
Is this a stated BS/MS program? If not, many times the classes taken at the undergraduate level, even if they are the same classes, do not count, credit wise, towards the masters.
I'd consider the CS/Stat degree, and pick up a finance class or two instead. Those will help you get a job programming for the banks, investment bank, fund managers, etc.