I get what you're saying, hardkore. As I understand it, your tuition for the year is $30k, but your total expenses, including books, room and board, etc. is $42k. Thats why your financial aid package, which includes the $6500 scholarship, your work study, and your loans, totals $42k. Engguy, I think you might be mistaken in your understanding of what a "financial aid package" is. The scholarship would just be one component of a financial aid package.
That said, I am in a somewhat similar position with a masters program and I chose to go. Like yours, my program was a perfect fit for what I wanted to do, but meant taken out more in loans than I wanted. I thought about what the degree would get me in terms of my interests and career, and what it would cost me. How much in loans will you be taking out? How much will you make with this degree? How long do you think it will take to pay them back? Have you looked at all of the scholarship , TA and fellowship opportunities? To get some perspective on this, I talked to a current student in my program who had great advice. I'm sure someone from your program would be willing to talk to you.
Then, think about the program and what you might get out of it. For me, the bottom line was that this was what I want to do and it's worth it to me. Take your time, and think about it. Since you're coming straight from undergrad, might you be able to defer for a year to work? Hope that helps.