Zamak is a zinc/aluminum/magnesium/copper alloy used in gravity and die casting. It is actually a very good alloy that has gotten a bad reputation it doesn't deserve. It's often mistakenly referred to as pot metal, which it is not. It has the strength of cast iron, weight of steel, excellent bearing properties, and excellent casting and machining properties.
Meteorite metal would be great. It's a nickel/iron alloy that only occurs in the vacuum of space.
Nickel silver is a good alloy. It doesn't tarnish like brass.