RE: best bang for the buck offroad vehicle
What kind of off road are you looking to do? For low grass and lots of dirt and some road stuff I'd go with a stadium truck. They will be faster and handle better. For a good fun time go with a Short Course truck (a little slower and heaver to start with). If you want to be able to do some good off roading in most conditions get a monster truck.
My only suggestion is the E-firestorm. Its a great stadium truck. strong as hell too.