The three choices are super rooster, novak super duty xr, or the traxxas evx. The rooster can handle 10 cells and around 10 turn motors in a clod while the super duty xr can handle a 16 cell twin pack configuration and any pretty much any motors and the evx can handle 14 cells, twin pack, with mildly modified motors. For your specs, I would go with a used super rooster as it's probably the best and cheapest choice.