loans, loans, loans. It's what most people do and as long as you finish what you start you should be ok. With that said, of course take out the least amount that you can.
I know that I'm a meddling old geezer but remember the less you spend the less you will need to borrow. Furthermore if you keep working and can borrow less in the first year than in the later years, because you put down a wad of your own cash in the first year, significantly less interest will accrue and you will owe a lot less. Keep working until the week before orientation!
I think that the loan programs work as follows: 1) You can borrow up to $8,500 per year on subsidized Stafford loans and these loans will not begin to accrue interest, if the cards fall correctly, until you finish a residency. This means that you'd owe $34,000 on this loan at the end of a four year residency. 2) You can borrow up to $32,000 per year from the unsubsidized Stafford program and interest begins accruing on disbursement but you don't start paying until you finish residency. If you borrow $32,000 per year in med school and spend four years in residency you will owe about $186,000 after completing a four year residency if interest is 6.5%. This means that you will owe about 5.8 times your annual borrowing costs under the unsubsidized Stafford program. 3) You can borrow up to your approved budget minus Stafford loans on Grad Plus and interest begins accruing on disbursement. If you borrowed $19,000 per year at 8.5% you would owe about $125,000 at the end of a four year residency or 6.6 times your annual borrowing. The result is that if you spend about $59,500 per year for school you will owe about $345,000 at the end of a residency.
However, if you saved $19,000 for the first year and avoided Grad Plus loans for the first year your Grad Plus debt would be about $89,000 after a four year residency. This means that you'd be $309,000 in debt at the end of residency instead of $345,000.
If you don't have the opportunity to make money at least be cheap. If you spend $51,500 per year instead of $59,500 your debt at the end of a four year residency will be about $292,000 instead of $345,000.