Return Offer Raise

Hi all,

I just received a return offer to work in corporate valuation at an investment bank. I interned there last summer and got excellent reviews and did all of my assignments well and really formed close bonds with my co-workers. I was wondering if I should try and negotiate a raise because of my newfound experience and I personally feel like I am worth more than I am paid. My current comp is 80k base and I'm in a mid sized city, how much should I ask for? Any advice would be appreciated.