Building a merc to go with my mf sorc

first of all...which merc should i choose to go with my lvl 99 mf sorc..she does pindle runs using pindabot...
anyways..i went for the barb..he's using ethreal gaze...3 topaz griz armor..and doombringer

i need a better sword and a better armor..what do u suggest for my barb..keep in mind..i need him to stay alive..and yet, have magic find on him

ps. how does the magic find work when my merc kills sumthing..does my mf add onto his, giving him an added bonus?