I would recommend Lincoln Financial as an option for a 457(b) provider. The Lincoln Director program is intedend for 401k, Profit Sharing, and 457 governmental plans.
The costs at Lincoln are extremely competitive and more often than not average .30 - .40% less than the other providers. The investment platform is a multi manager approach with everybody from American Funds, Fidelity, Blackrock, Delaware, Alliance Bernstein, and others. The Director also has a great investment advice provider, 401k Toolbox, that was named Advice Provider of the Year in 2004.
I can be reached at firstname.lastname@example.org for further questions or information.