Space Odyssey (Space Mission) is a very strong game. Nip It is fun but its price is artificially inflated by sellers due to the "Happy Days" connection.
I happen to love games from all EM manufacturers (though Gottliebs do tend to stand out quality wise) and I love multi-player games as much as I do single player games. Heck, I even prefer Target Alpha over El Dorado. Blasphemy! I know....