Since I have no idea what the shot's going to be like each week in a couple of my leagues, I usually basically have to take 5 to make sure I have every condition covered. Two solids, two pearls, and a spare ball. (I've had to slow roll it up the 6 board with a Dimension one week and throw it fast over 15 out to 5 with a Spit Fire the next!) For my Tuesday night league on synthetic lanes, I could very easily get away with just one solid, one pearl, and plastic, but it's not worth the effort of rearranging my bowling bag, etc.
