oxo good grips potato ricer
you could get the squiggly masher, but that is a uni-jobber (like unabomber, but worse because you're wasting your money) because it can only be used to make "smashed" potatoes. a potato RICER will make soft, fluffy, finely mashed potatoes so that big chunks won't knock out Grandpa's dentures. PLUS, you can use the ricer later when you're making gnocchi.
This is one of the best device I've used. Can't go wrong with a potato ricer!
fluffy mashed potatoes!