Thanx. The more I read, the more I think that rubber bushings are fine for a cruiser, and that the poly urethane ones are fine for racers, but have some draw-backs. They tend to squeek, they're stiffer, they HAVE to be properly aligned, they should not come into contact with oil or WD-40, and they are more expensive.
I think I will go for the rubber bushing set from Classics, and a bit bigger swaybar.