Our expenses (car, phone, food, fuel, medicine, toiletries, etc.) are $1600 a month without the loan and credit payments (living with the folks). My student loan payment (most of it from b-school) is $1200 and the credit cards are $300 a month. Her student loan (also most of it from grad school) is $1000 a month. Note that we could do income based repayment where the loan payments are lower (it's 15% of your income above the poverty level, which I think is around $11,000 dollars). The balance is forgiven after 25 years of payments.

Her income is virtually non-existent right now.

We don't mind deferring a home purchase for the next few years (though we would like to move to Boston in a few years [which has a high cost of living]) and we can't have children for medical reasons.

As for finance jobs or other high-income jobs I have been under the impression that these are hard to come by if you're not near the top of the MBA class (my GPA 3.44/4.0), haven't done an internship, and don't get hired shortly after you graduate. Let me know if I'm wrong about this though.