For all of you participating in The Core event my recommendations for armors would be:
High level Eviscerators (level 4-5 core):
Rutuba (5F shop) Spartacus (5F shop) or Perseus (5E shop) and add Pulsar 2 (7C shop) or 5E (shop 7B). Perseus + Pulsar 2 offers the best defence. Vain and Chronicle could also be considered as options.
High level Harbringers (level 4-5 core):
Pegasus (5E) + Pulsar 6 (7C) is all the defence you might need - average damage 4 from a Gen 10.
Other options could be: Infiltrator (5E), Eon (5F) or Hermes (5F) + Pulsar 6 (7C) or Pulsar 7 (7C). Both pulsars fit the same and both sets give arround 4 damage too. Hermes is the cheapest option out there considering MU.
Mid level Eviscerators (level 2-3 core)
Rutuba (5F) Spartacus (5F) or Perseus (5E) without platings should be enough or if you want the best defense add Pulsar 2 (7C) or 5E (7B) to them to get 1 damage and the possibility to have zero healing time.
Thunderbird (5F) with Pulsar 2 (7C) could be used as a cheap alternative.
Mid level Harbringers (level 2-3 core)
Pegasus (5E) with no platings gives maximum defense. If you want cheaper options, you could go for Hermes (5F) or Eon (5F) with no plates or eMine (5E) with Pulsar 6 (7C) or Pulsar 7 (7C).
Low level Eviscerators or Harbringers (level 1 core)
There are just too many options to go through here. Anything that was mentioned above will give you maximum defence or if you need a cheap alternative eMine (5E) with no plates could be an option or Bear (5F) or Boar (5F) armor with 4D (7B) plates.
There are of course many other options you could pair up. You could add something up using unlimited plates, but these are the suggestions from me. Hope they help.