Dragonfire is awesome, good pick.
I second Atlantis, Montezuma's Revenge, Phoenix, Wizard of Wor, and Demon Attack.
If you pick up any homebrews, I highly HIGHLY recommend Medieval Mayhem. It's really pretty fantastic. Fall Down is awesome as well, though you should really have people to play with for both games. Medieval Mayhem is 4 player with paddles, Fall Down is 2 player. You can play them both by yourself and have plenty of fun, though.
- Tom