I'm in a similar situation...out of school for nearly a decade, MBA and masters degrees, debt from those and undergrad, and very interested in staying below the maximum federal limits.
Well, if you get good aid packages, you have nothing to worry about. If not, I'd explore lower-priced publics that would consider granting you in-state tuition rates off the bat. I would imagine you could get a good deal in NC, no?
Labor law and dispute resolution...nice! That's my interest also. I'm headed to Rutgers-Newark for a joint program in the School of Management and Labor Relations. Have you considered a joint JD/masters program at a labor institute? Some options I can think of off the top of my head include:
Cornell: JD/Master of Industrial and Labor Relations (School of ILR)
Ohio State: JD/Master of Labor and Human Resources (Fisher School of Business)
Minnesota: JD/Master of Human Resources and Industrial Relations (IRC of the Carlson Business School)
and of course...
Rutgers: JD/Master of Labor and Employee Relations (SMLR)
Best of luck whatever you decide.