So I'm nearing the end of a MS in Engineering Physics (hopefully not more than 2-3 more part-time semesters... having a day job has its draw backs). What I'm interested in hearing about is on the "now what?" I have senior coworkers who think I should get a PhD (would probably be Nuclear Engineering given both intellectual interest and that I work in the nuclear industry), others have suggested following the MS with a MBA. Frankly all I can think is about how nice it would be to sleep at night without thinking about problem sets and exams. So, what are opinions about the two options my coworkers keep suggesting (nay, keep pushing).