KMK, good luck with this goal. My husband and I are working on paying off $26,000 in student loan debt (a small sum compared to your total) for his MBA. I also paid off about $20,000 in student loan debt right out of professional school (7 years ago).
For my student loan debt, I refinanced and locked in a low rate for 30 years but continued paying the debt on a 10 year schedule (the original term of the loan). I put all my bonus, tax refund, found money towards my student loan. Also, once my car was paid off I continued to pay the car payment but towards my student loan. I was able to pay off my student loan in 5 years.
For my husband's student loan debt, he also refinanced and locked in a low rate for 30 years and then only paid the interest the first 2 years of repayment. We are determined to pay off his loan this year, so we set up an automatic payment based on a 10 year repayment schedule (the lender's minimum payment was so low that if we paid the minimum payment we would never pay off the loan - it doesn't even cover the interest) and we will begin attacking the loan after our other unsecured debt is paid off.