I thought of some different stats for different NPCs. These could have rewards for common NPCs.

Cargo Level
Lvl: 1 - Extremely small chance for some mineral points. (Extremely Common)
Lvl: 2 - Small chance for some mineral points. Extremely small chance for artifact points. (Common)
Lvl: 3 - Fair chance for some mineral points OR artifact points. (Uncommon)
Lvl: 4 - Good chance for moderate mineral OR artifact points. (Rare)
Lvl: 5 - Very Good chance for high mineral OR artifact points. (Extremely Rare)

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Reputation Level
Lvl: 1 - Very weak reputation, regular EXP gained. (Extremely Common)
Lvl: 2 - Weak reputation, 1.2x EXP gained. (Uncommon)
Lvl: 3 - Matched reputation, 1.4x EXP gained. (Rare)
Lvl: 4 - Strong reputation, 1.6x EXP gained. (Very Rare)
Lvl: 5 - Very Strong reputation, 1.8x EXP gained. (Extremely Rare)

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Intelligence Level
Lvl: 1 - Extremely weak hacker, extremely small chance for extremely small amount of research points. (Extremely Common)
Lvl: 2 - Weak hacker, small chance for small amount of research points. (Common)
Lvl: 3 - Good hacker, fair chance for moderate amount of research points. (Uncommon)
Lvl: 4 - Experienced hacker, good chance for high amount of research points. (Rare)
Lvl: 5 - Extremely Experienced hacker, very good chance for very high amount of research points. (Extremely Rare)

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These are what I though of. If there are any that have issues (which may be a lot), please comment of them.