The Sentinels are a really good call for the Borg.
Sentinel Mark V (GSX G02)
WE ARE THE BORG (Running Shot)
ADAPT AND ASSIMILATE: Sentinel Mark V can use Outwit. Sentinel Mark V can use it normally, or Sentinel Mark V can use it targeting each opposing character with two action tokens that is within 10 squares and line of fire. You may counter a different power on each character.
RESISTANCE IS FUTILE (Charge)
OVERWHELMING SIZE (Flurry)
DRONE BOARDING PARTIES: Sentinel Mark V can use Incapacitate. When it does and hits, choose one: a hit character can't be moved by any game effect until your next turn; or a hit character receives two action tokens.
ADAPT TO SHIELD FREQUENCY (Penetrating/Psychic Blast)
ASSIMILATE RESOURCES (Super Strength)
REDUNDANT SYSTEMS (Invulnerability)
ADAPT TO YOUR WEAPONS (Toughness)
DISPERSAL FIELD (Energy Shield/Deflection)
Ranged Combat Expert
HIVE MIND (Enhancement)
INCORRECT STRATEGY, NUMBER ONE (Close Combat Expert)
CUTTING BEAM (Exploit Weakness)
Not to mention the "Assimilation" of capturing ships with the older Sentinels.