*** NPC damage types ***
Guristas - Kinetic & Thermal
Serpentis - Kinetic & Thermal
Mordus - Kinetic & Thermal
Blood - EM & Thermal
Sansha - EM & Thermal
Angel - EM, Kinetic, Thermal & Explosive
Mercenary - EM, Kinetic, Thermal & Explosive
Rogue Drones - EM, Kinetic, Thermal & Explosive

*** Best damage types to NPC ***
Guristas - Kinetic
Serpents - Thermal
Mordus - Thermal & Kinetic
Blood - Thermal
Sansha - Thermal
Angel - Explosive
Mercenary - Thermal
Rogue Drones - EM

*** Medium drone damage types ***
Infiltrator: EM
Hammerhead: Thermal
Valkyrie: Explosion
Vespa: Kinetic

*** Heavy drone damage types ***
Praetor: EM
Ogre: Thermal
Berserker: Explosive
Wasp: Kinetic

Anomaly Levels Difficulty Ranking in Nullsec:
Forsaken Rally Point > Hidden Hub > Hidden Forsaken > Hidden Forben > Haven > Sanctum.

http://alysii.com/eve/pi/ (Planetory connection chart)