Too much to go into, but do NOT borrow any more than you absolutely have to. 6.8% is not a great interest rate and you do realize that you will mostly be paying back your loans with after tax dollars, right? Given the current trend of cutting physician earning potential, increasing hostility toward any high earner, caps on student loan interest deductions, and phase outs you'll be paying much more than you believe right now.
Also -- don't buy the conventional wisdom BS on inflation/deflation either. If you want to learn more on the matter, start here:
www.mises.org