I would buy a tough used competition truggy and convert it to brushless. The truggy can do everything, you can race with it (it's lighter than a MT/muggy) or bash with it, you can even make it a MT with heavy big MT tires.
The 1:8 scale truggies are mostly designed for heavy racing, so they are build like tank.
IMO, the RTR ("Ready to Repair"
) like revos or savages flux just can't match in terms of reliability and weight. I often bash with theses vehicles and they always have drive train problem in the conical... Theses trucks can't handle the torque of brushless motor, even with 250$ of options (let me laugh about HPI "bullet proof diffs" ^^)...
Look for a used mbx6t or Xt8, it should be plenty for you !