Unfortunately with no income during school you won't be able to contribute to a Roth IRA. If you could buy a house and get a good deal, I would strongly consider that. In my area you can find nice townhomes under $100k. If not, this is what I would do:
(1) take the $8,500 of subsidized Stafford loans each of the next two years.
(2) take the $17,000 that it will take to repay the stafford loans and invest it in a safe investment. You'd have to use your judgement when choosing where to invest, but you don't want to lose this money as you'll be using it to pay back those Stafford loans at the end of 4th year.
(3) use the other $43,000 to pay for school until it runs out
This way you still have a buffer of savings ($17,000) while getting an interest free loan from the government in the form of the subsidized Stafford loans.
Just keeping the whole 60 grand out you are assuming you are getting a guaranteed rate of return > 6.8% as that is the interest you are paying.