To give you guys an idea as to what I did...
Savings: $50K
Loans: $105K (with accrued interest, this became ~$115K at graduation)
I basically covered all non-tuition expenses with savings and tuition came completely out of loans. I had more savings that I could have used to pay for tuition, but they were in long-term investments that I didn't want to mess with.
My pre-MBA spending habits were about $25K per year all in, so I figured the $50K would cover me for the MBA and it did, I had about $20K left over at the end. However, that includes the $20K or so that I made during the summer internship, so in reality my estimate of $50K was pretty accurate.
However, one thing to keep in mind is that you not only have to pay for the 18 months or so that you're doing an MBA, but also the period before you start working. A lot of jobs leave you with 1 or 2 months of vacation before you start and, if you're moving, you'll be responsible for a lot of expenses before you get your first paycheck. For example, I had to move a long distance, find temporary housing, then find a place to live. So I was looking at a deposit and two months rent before I ever got my first paycheck (or moving expenses reimbursed). Came to about $10K, so I'm glad I still have some savings in reserve.
RF