I don't feel that as master's degree would guarantee you a job in clinical research. what employers want in entry level people is clinical research experience, a master's degree would just be a bonus, not a necessity.
i would decide on what type of job do you want- regulatory affairs and QA sounds good, but it is very limiting only to Reg/QA jobs. getting a masters in clinical research may be more broad and allow you to apply for a lot more positions.
if you really want a job, get a CTA or CRC job (NJ is a good spot) and do your master's part time. a year or two experience as a CTA/CRC and a master's will be very helpful moving up in the industry.