Quoted from Frippertron:

Sure, I could say Quicksilver, Cyclopes, or Alien Star as well, but let’s be realistic. These games are RARE and nigh impossible to locate them without crazy connections and perhaps, stupid money. I would definitely recommend Eight Ball Deluxe as my number one. Just something special about that game. Other early SS Bally’s that are great, include, Paragon, Skateball, and Harlem Globetrotters.
Some great William’s early SS pins are Blackout, Alien Poker/Laser Cue, the aforementioned Firepower, and Flash. As far as Gottlieb goes, Joker Poker, Countdown, and Sinbad are all fun pins. Early Stern, you are looking at Meteor, Stars, and Big Game.
Lastly, if you wanna get your feet wet with some EM’s it’s tough to go wrong with 70’s era Gottlieb’s. El Dorado, Quick/Fast Draw, Jungle Queen/Princess, Atlantis, Abracadabra/Team One. It wouldn’t hurt to add a good ol’ spinner ripping Williams like Grand Prix, Argosy, or Aztec. Best of luck, hope this gives you a couple ideas.