Thanks for posting.
Regarding your low GPA, I recommend you read this case study of how one candidate addressed a low GPA and was accepted into a top business school: http://www.stacyblackman.com/comprehens ... ies/case5/
For whether to pursue a Masters, I would not recommend pursuing an additional degree for the sole purpose of improving your chances for admission into a top business school. In fact, many admissions officers may ask you why are pursuing an MBA program after having already received a Masters degree.
For which career path to pursue, I recommend pursuing the area you are most passionate about and where you feel you would make the largest impact. In the end, this is what admissions teams would like to see.
If you'd like, we also provide free 30 minute phone consultations here: http://www.stacyblackman.com/contact/
Conrad and the Stacy Blackman
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Stacy Blackman | Stacy Blackman Consulting Inc | http://www.StacyBlackman.com | +1 323.934.3936
MBA blogger, US News and Author, The MBA Application Roadmap