Two VX's would be fine. My personal preference is one speed and one torque. You want speed but the buggy tires are kinda heaevy. You want 200in/oz's at a minimum in my eye's. A minimum of 100in/oz to still have enough torque to engage and hold the brakes, with some speed on it for the reaction time. And the stronger you go, the heavier your thottle return device needs to be to close the carb in the event of mechanical failure.