Well, fuck.
Smallest to Largest Site: Burrow > Hideaway > Refuge > Rally Point > Den > Yard > Port > Hub > Haven > Sanctum

Enemies ------- Hardener to use ---------- Damage type to use
-------------------------------------------------------------
Blood Raider --- EM/Thermal --------------- EM
Guristas ------- Kinetic/Thermal ------------ Kinetic
Sanshas ------- EM/Thermal --------------- EM
Serpentis ------ Thermal/Kinetic ------------ Kinetic
Angel --------- All Resis (pri. Expl, Kin.) --- Explosive
Mordus -------- Kinetic/Thermal ------------ Kinetic
Rogue Drones -- All Resis (pri. Expl. Kin) ---- EM
Mercenary ----- All Resis (pri. EM, Therm) --- Thermal

Stacking Penalties
Mod 1 = 100% effect
Mod 2 = 87% effect
Mod 3 = 57% effect
Mod 4 = 28%

Amarr - RADAR
Minmatr - LADAR
Caldari - Gravimetric
Gallente - Magnetometric

Sentient - Drones
Dread - Guristas
Domination - Angels