While we could all tell YOU what WE would do, we all have a different opinion. The quantitative analysis is that you should calculate your average return. Then, use that as a discount rate to decide what to do with capital.
The qualitative side is, how are you sleeping? If it bothers you, is it worth a marginal x%? I'd say no. When I was young, it bothered me very much. So, despite having interest free loans, I still paid them off within a couple years of graduation. I literally laid in bed at night and calculated how much time I had left if I paid $x the next day.
I personally think, you definitely CANNOT go wrong paying off debt.
"If you only have 1 year to live, move to Penn...as it will seem like an eternity."
Good to see you back, I was starting to miss your incisive commentary!