do you need a
bulb across the stage or just a beam of light. If its just a beam of light, then the cheapest and easiest way would be to get a spot with a narrow beam and use that to run it. Just tell the spot op where and when the beam should move, and you should be set.
If you really don't want to use a spot light, I would say use a ML, but they are expensive, and if you already have a spot light or two, then the spot light would be the easiest.
Regardless, I believe that a spot light would be cheeper to rent/buy then a ML.