I guess I'm in a bit of a different situation, since I'm in a professional program (MPP) rather than academic, but just to chime in...
This educational opportunity/career is my passion and the result of countless hours of work (and more to come!). That being said, nothing will ever be more important to me than my relationship with my SO. Than again, he's more than willing to relocate and is a "one day at a time" person rather than the obsessive planner I tend to be.