in my opinion I would say this is the best time to do MS since its recession and would be really hard to find a job ( but i dont think you would have a problem in this front because you already got a job).
Now if you go ahead a bit in the future, two years from now economy will improve and surely many job opportunities will be there. So right after you complete your MS you might just land up in a good job.
And about on campus jobs there would be plenty available , which would cover your living expenses. If you manage to get a TA or RA or GA you would'nt need to worry about the tution fees too.
So summing it up - my opinion go ahead
