pro light questions

1-16 bit resolution/pan tilt are the same. Smoother movement usually has 2 extra channels for fine pan and tilt.
2- both can have wider beam
3-3 facet prism gives 3 images
4- never

What I need is the fattest beam I can find.The powerspot 250's have a 11 degree beam angle and that sounds pretty skinny. I need wide coveridge so do I need a higher degree beam angle or am I misunderstanding what a beam angle means?

Depends on what your requirements are; most spot-type fixtures have 9-11.degree angles. Wash-type fixtures have much larger angles, and are normally manually adjustable as well.
It may be more helpful if you check the image size at a particular distance. You may have to contact the manufacturer for this info, as it is not always readily available.