Taking some time to build your collection and buying games one by one is the way to go. I built a collection of 26 pins in two years. I bought the games one by one. Do a lot of research if you're not sure which games you will like. I've probably spent thousands of hours reading pinside and other website reviews, watching youtube videos, playing pinball arcade and other pinball video games to figure out which games I like best. Another good way to find out which games you like is to travel to pinball shows, arcades, and make friends with pinsiders. You can try out some of their games while letting them play your pins when you get them.