ISC-squared's CISSP credential. Given your background and experience, if you read one of the good study guides for the exam (Shon Harris, Roberta Bragg both have their own good books, and Mike Chapple, James Michael Stewart, and I just revised a pretty good book for Sybex for the CISSP exam), you should be able to earn the credential with relative ease. This way you can offer both the master's degree and a certification to your current or prospective employer, thereby maximizing your perceived value, and thus also the probability of attaining whatever career outcomes you're seeking to facilitate.
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