someone i know with no work experience and only a bachelors degree and a TS SCI FSP just accepted a competing offer (very small company) for 90k, with guaranteed 10k raise in 12mo.
your value differs depending on the clearance
generally speaking, for ENTRY level (<2 yrs exp, no masters), with a non-DoD TS clearance they can get 65-75, with a masters add about 10k. this is with big companies like BAE, Raytheon, Northrup, lmco etc. if you go smaller you will get a bigger cut, but probably not as good benefits.
80 seems low unless it is a dod clearance, then it sounds about right