Basic ideas:
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Variety is key
  "Something for everybody to enjoy."
  Think about technologies, theme, age, gender, etc.

Game Selection Ideas: By Categories
  NOTE: Again, these are generalities. One size does not fit all.
  Something for the women -- Centipede. Possibly Ms. Pac-Man, Arkanoid, Frogger.
  General Crowd Pleaser -- Driving Game
  Kid Games (often physical/redemption) -- Skee-Ball, Whack-A-Mole, etc.
  Pinball Game -- Something for the pinball fans.
  Classic Arcade Games -- One of the many major classics from 1980-1983.
  Vector Arcade Games -- Asteroids, Star Wars, Tempest, Star Trek, Battlezone, etc.
  Electro-mechanical -- Old. Not usually used, but a possibility.
  Black-and-white -- Not highly sought-after, but a possibility.
  Recent games -- Something from the past few years for young 'hip' players.
  Shooters -- Standard shoot 'em up space games.
  Laserdisc -- Unique, but learn more about them before getting one.
  Different cabinet types -- Cabaret, cockpit, cocktail table.
  Video game consoles -- Modern or past home consoles with a selection of games.
  Cartoon Movie Theather Booth -- Unusual and rare. Not usually used.
  Japanese sit-at cabinet -- Unusual styling, large screen, good for kids too.
  Bar-top arcade game -- Typically has some generic games.
  Competitive physical games -- Foosball, Air Hockey
  Large competitive physical games -- Take up a lot of room. Pool, ping-pong.
  Dart Machine - The coin-op w/video are probably the best.