Toubab
I live in Chapel Hill, NC, where the cost of living is just a little higher than out in Winston. (I'm going to Fuqua next year, so we're on sorta the same page!) Here's my projected breakdown:
Rent: $750 (I pay $300 now - wow! - and this is a high estimate in Durham. Will probably be more like $500)
Food: $200 (this is just groceries)
Petty cash: $400
Gas, misc: $200
Total: $1,550
This is a good deal higher than my current monthly expenses, but again, I'm being conservative. Multiply by nine months, and it's a bit below what Duke (and Wake) budget for you.
I'm also not planning on living alone in b-school.
Depending on choices, this estimate could be right on or a little low. I am planning to live alone, but plan to take an inexpensive apartment over by East Campus -- if someone wanted to live alone or in an expensive 2br in one of the popular buildings most JDs and MBAs stay in, you can easily hit $1000/mo. including utilities for rent.
The nice thing about Durham is that if you're going to splurge on housing, you can actually do quite a bit better than Station Nine/Lofts/etc. by actually taking a house. Lots of houses to the northwest of East Campus, roughly 1-1.5 miles from the b-school, for about $1000/month. I am down south of West Campus and renting a townhouse with my wife for $825/mo (utils not included).