Some of the medicine balls that are out now have a handle build into them to get the same effect.

This would give you a far more versatile piece of equipment, kettle balls seem great but kind of illogical for the home gym when you can get just as good of a workout from many other pieces of more versatile equipment.
I agree with Bald Freak, dumbells are also very versatile and the power blocks are great for home use.