AS for tolls...get the Sunpass. The tolls are actually discounted with it. Also, most of the state is removing toll booths and use overhead cameras. If you get the toll bill by mail, the admin fees on top of the tolls are ridiculously expensive.
Get a Sunpass, and if you plan northeast and mid-atlantic travels look into EZPass as well. at some point (way into the future the way it looks) Sunpass and EZPass will combine systems.
Delaware E-ZPass - Where To Use E-ZPass