The above info is right on concerning the subsidized/non-subsidized. I would also agree about not taking out any more than you absolutely need to. When I was in school I took out more than I should have, and now its' going to cost me a minimum of $350 a month for 30 years. That money could have gone to getting me a nicer car, or a better house, or hell a decent gun every two months. Of course, even minus the $4200 a year, I still make twice what my non-college-educated friends do, so I can't really complain.
I know you didn't ask for it, but I thought I'd question your choice of major. I know several people with radiology degrees that have found better livings in the paperwork world. I also know one girl who went into the Army Reserve, had them pay for all the training, and only has to take the exam to become certified. Now she not only doesn't have loan payments, but she's also getting paid to go play Army once a month. Its something to think about.
With you already having a BA, I'd look into various master's programs. Alot of them take less than two years these days, and you could get a masters degree in something that's more marketable than International Studies. There's also more $$ available in loans for masters studies. Of course, this means more you'll have to pay back.
Like I said, I know you didn't ask for a critique on your choice of profession, I just thought I'd offer some advice. If you're going to wind up owing $24k, its alot easier to pay back with a $50k a year job than it is with a $30k a year job.