well first off I wouldn't rush to buy a new ball, talk to the house and see if they are intending on keeping that shot.  Honestly that shot is near impossible to hit and I don't think they will keep it.  You will want plastic or MAYBE a weak drill power groove. Niether of which will be great on anything but that shot and may not be good for that shot.  If its really 20 feet I don't feel there is much of an option.