Just to throw out some numbers (if I'm wrong on something, someone please let me know)...
At 6.8% interest--the current stafford rate-- monthly payments on a $10k loan over a (10,15, 25) year time horizon will be ($114, $88, $68). Which maybe doesn't sound so bad. But wait...
Then there's the limit on federal grad school loans to consider. If you're looking at places that will run $20k/year on the low end, then anything above that is going to be coming from private loans. Those will be at a rate higher than 6.8%. At 7.8%, the monthly number above becomes ($119, $93, $74).
So $10k difference per year becomes an additional $30k after three years. The $60k in loans becomes $90k.
60k at 6.8% means you'll be paying back $400 a month for the next 25 years. But $90k where you have to get the additional money at 7.8% means you'll be paying back $630 a month for the next 25 years. Your monthly payments increase by 54% even though the amount borrowed only increased 50%. At 8.8% on private loans (who knows what you'll end up with), it's closer to a 60% increase.
Maybe that doesn't mean much to you, but it's worth considering (especially as you get a clearer sense of what kind of private loans you can get).
It's probably a good idea to really stare at the numbers for awhile and think about what the psychological impact of debt may be on you down the road. Only you know yourself and what will be significant. Maybe with less debt you'll feel more free to take a job you prefer instead of one that lets you keep up with your bills. Maybe it will put you in a better position to start your own practice if that's something you dream of. Or maybe you love the student lifestyle, can live on the cheap and will pay down your debt in 5 years (which would be $1,800/month to cover $90k borrowed at 6.8%/7.8%).
My only point here is that the last dollar you borrow will be the most expensive dollar you borrow. And regardless of how you structure your payments, it will be the last one you pay off.