Opinions, please.

[Shannacore]

I recently started a pretty great job. Pay is more than I've ever made, the job offers full benefits (to include paying for part of my tuition. I'll be starting a three years Masters Program in January.), paid time off, sick leave, etc. The job is also only part time, so I'm only committed to 20-28 hours a week - perfect since I am still a student / 40 hours a week are for suckas. It's an administrative job at the School of Nursing, which has absolutely nothing to do with my degree or career aspirations (Which is Urban Planning).

Today I discovered that Bernalillo County (where I live) is hiring two interns in the Zoning, Building, and Planning Department. This would be a part time (20 hours or less a week, I assume) position paying a flat rate of $5 less than what I am making now. No benefits. No paid time off. No tuition assistance.

Is it worth giving up the job I have now to get my foot in the door? Planning jobs that don't require "years of experience" are VERY rare, and up until now I virtually have no experience aside from my education. Is the severe drop in pay + benefits worth beginning my career? Or do I wait until my current job has paid for most of my Masters degree? Then start looking for Planning jobs? HELP