Best Tank for Npc's:
Amar/Raiders/Khandid/Sansha - EM/Therm
Caldari/EoM/Odamian/Serpentis - Therm/Kin
Gallente/Gurista/Mordus/Syndicate - Kin/Therm
Angel/Republic/Thukker - Exp/Kin
Rogue Drones - Exp/Kin/Therm
Merc/Sleepers/Concord - Omni

Best Damage to NPCs:
Angel/Thukker - Exp
Caldari/EoM/Gurista - Kin
Merc - Therm
Blood Raiders/Sansha - EM/Therm
Syndicate - Kin/Therm
Rogue Drones - EM
Mordus/Serpentis - Therm/Kin
Concord - Kin

Stacking penalty
1st module > 100% of bonus
2nd module > 87% of bonus
3rd module > 57% of bonus
4th module > 28% of bonus
5th module > 11% of bonus

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http://i.imgur.com/4E546oq.jpg
[05:21:18] Rafael Argus > "AHHH! I'm in a borrowed Orca!"