Well a Dart is spinning at half the speed that your pan world is, but my iwaki md-40 is pretty quiet, so I don't know if it'll quiet things down too much.
Noise aside however, if you went with a dart/snapper, then you would gain some flow and probably save some wattage. You don't really need to be using the pan world in a CL situation, as there really isn't too much head to deal with.