I think Excel has templates for mortgage calculators. I'd do up one with your current loan, and find out out how much it will cost you, from this point forward. Then start any number of new files for these various options that you have. Add closing costs to those sheets, then figure out which one has the lowest cost spent.
Failing that, you should be able to find calculators online. Again, figure out total cost from this point forward (since you can't fix whatever you've already spent).