Which Bank Is the Best for Private Student Loans?

loans

I am trying to apply for a private student loan because my Stafford loan won’t cover my entire semester. Which bank has the best fixed interest rate, and highest turn-over rate for long-suffering loans?

Thanks for any input!
I have a ready and willing co-signer that has a fantastic credit score and very stable employment, so getting a loan is not a problem. I would just like to know what bank is the best to go with for such a costly choice. Thanks again for helping!