+1 to arebelspy - my wife is a Massachusetts state teacher and has access to both a 457 and 403(b). I believe we can max both, meaning that with my 401k we can put aside a mean 54k pretax.
In her case the 457 is the same across the state and looks pretty good as far as fee and fund selection. For the 403(b), however, there are about a dozen companies she can work with. All of them appear to be insurance company-type setups with a contact number for a local person. Whenever I see a local contact I think FEES! PERSON TRYING TO SELL ME OVERPRICED FUNDS. So just a note to be careful in your 403b selection.